Abstract
Background.
Exposure to child maltreatment has been shown to increase lifetime risk for substance use disorders (SUD). However, this has not been systematically examined among race/ ethnic groups, for whom rates of exposure to assaultive violence and SUD differ. This study examined variation by race/ethnicity and gender in associations of alcohol (AUD), cannabis (CUD), and tobacco (TUD) use disorders with three types of childhood interpersonal violence (cIPV): physical abuse, sexual abuse, and witnessing parental violence.
Method.
Data from the National Epidemiologic Survey of Alcohol-Related Conditions-III (N: 36 309), a US nationally representative sample, was utilized to examine associations of DSM-5 AUD, CUD and TUD with cIPV among men and women of five racial/ethnic groups. Models were adjusted for additional risk factors (e.g. parental substance use problems, participant’s co-occurring SUD).
Results.
Independent contributions of childhood physical and sexual abuse to AUD, CUD, and TUD, and of witnessing parental violence to AUD and TUD were observed. Associations of cIPV and SUD were relatively similar across race/ethnicity and gender [Odds Ratios (ORs) ranged from 1.1 to 1.9], although associations of physical abuse with AUD and TUD were greater among males, associations of parental violence and AUD were greater among females, and associations of parental violence with AUD were greater among Hispanic women and American Indian men.
Conclusions.
Given the paucity of research in this area, and the potential identification of modifiable risk factors to reduce the impact of childhood interpersonal violence on SUDs, further research and consideration of tailoring prevention and intervention efforts to different populations are warranted.
Keywords: AUD, CUD, maltreatment, NESARC, trauma
Introduction
Exposure to child maltreatment and related aspects of the rearing environment (e.g. parental substance use, parental violence) have been shown to increase the risk for substance use disorders (SUD) and comorbid psychopathology (McLaughlin et al. 2010). However, recent studies have shown that these exposures are not as strongly associated with SUD among African-Americans (AAs; Sartor et al. 2015; Werner et al. 2016a, b) and that associations may differ by gender (Smith et al. 2010; Schiff et al. 2014). These findings, together with known differences in rates of exposure to childhood trauma (Roberts et al. 2011; Sumner et al. 2015) and adult SUD (Grant et al. 2015; Chou et al. 2016; Hasin et al. 2016), warrant further research investigating potential racial/ethnic and gender heterogeneity in the relation of childhood trauma and adult SUD.
Three recent studies utilizing data from the Missouri Adolescent Female Twin Study (MOAFTS) and the Missouri Family Study have shown that the influence of childhood trauma on SUD differs among AA and White women (Sartor et al. 2015; Werner et al. 2016a, b). Werner and colleagues found that childhood physical and sexual abuse were associated with the transition from alcohol initiation to DSM-V alcohol use disorder (AUD) among Whites, but not among AAs (Werner et al. 2016a). Another study (Werner et al. 2016b) showed that childhood physical abuse predicted transition from cannabis initiation to DSM-IV cannabis use disorder (CUD) symptoms among Whites, but not among AAs. Further, this study revealed different psychiatric predictors for cannabis initiation and the transition to DSM-IV CUD diagnosis among White and AA participants. Given the relatively small number of AA participants in the MOAFTS (N = 554, ~21% exposed to sexual abuse and ~47% exposed to physical abuse, ~25% with AUD or CUD), the null association observed among AAs may relate to a lack of statistical power. Alternatively, distinct etiologic models of SUDs could be implicated, wherein rates of exposure to childhood trauma, substance use, and the role of other important risk factors (e.g. depression, parental SUD) in the relation of childhood trauma and SUD may differ by race/ethnicity. Further, the samples consisted of all-female populations residing in Missouri, limiting generalization of these findings to males, non-twins, and individuals in the US general population.
Several studies have found that women have a higher risk for SUD following adverse childhood experiences [e.g. parental violence (Smith et al. 2010; Schiff et al. 2014)], while some studies found that men had a greater risk for SUD [e.g. sexual abuse (Kendler et al. 2015)]. Recently, a large Canadian populationbased study (Fuller-Thomson et al. 2016) indicated no significant gender differences in the associations of maltreatment with alcohol or drug dependence. Differences in measurement, sample composition, and developmental timing of outcomes are clearly important sources of these mixed findings (Kristman-Valente & Wells, 2013), however, it remains unclear whether associations of childhood trauma and SUD are more pronounced for males or females.
There are several important factors that may impact group differences in associations of childhood trauma and SUDs. In the USA, the most common SUDs, AUD, CUD, and tobacco use disorders (TUD), vary in prevalence by race/ethnicity and by gender (Grant et al. 2015; Chou et al. 2016; Hasin et al. 2016), as do cultural norms and acceptability of substance use and problems (Caetano & Clark, 1999; Sartor et al. 2013; Zapolski et al. 2014). Rates of exposure to interpersonal violent trauma also differ across race/ethnicity and gender (Roberts et al. 2011; Breiding et al. 2014; Sumner et al. 2015). Further, SUDs are often comorbid, both with each other and with other psychopathology (Kessler, 2012). For example, individuals who meet criteria for CUD also have higher odds of meeting criteria for AUD or TUD [Odds Ratios (ORs) 7.8, and 6.6 respectively (Hasin et al. 2016)], and are more likely to experience other mental health problems, especially mood disorders (Grant et al. 2015). Given this high degree of comorbidity, it is important to consider the associations of childhood traumas with a given SUD, and potential racial/ethnic and gender differences, in the context of other commonly co-occurring substance use and psychiatric disorders.
Relatedly, traumatic exposures, particularly when experienced in childhood, rarely occur in isolation. Childhood physical and sexual abuse often occurs in the context of a stressful rearing environment characterized by other types of interpersonal violence (IPV) including parental physical violence (Bottoms et al. 2016), and/or parental mental health and substance use problems (Sartor et al. 2008). Therefore, individuals who meet criteria for AUD, CUD, and TUD are more likely to have experienced childhood maltreatment (Dohrenwend, 2000; Khoury et al. 2010; Sartor et al. 2012), in addition to other related familial risk factors, such as parental substance use and parental violence (Howell et al. 2014). Due to the clustering of both adverse childhood experiences, and adult substance use and psychiatric disorders, disentangling the specific effects of any individual risk factor to any particular SUD are challenging (Sartor et al. 2008). Although such investigations are rare, a recent study conducted with a Canadian general population-based sample reported independent effects of three adverse childhood events (physical and sexual abuse, and witnessing parental domestic violence), when mutually adjusted for, in alcohol and drug dependence (Fuller-Thomson et al. 2016). While this study examined variation by gender, differences by race/ethnicity were not explicitly investigated.
In summary, recent findings indicate the importance of considering potential racial/ethnic and gender heterogeneity when examining the relation of childhood IPV and SUDs. However, it remains unknown if the relation of childhood trauma and SUD differ by race/ethnicity and/or gender. The current study aims to fill this gap by utilizing data from the National Epidemiologic Survey of Alcohol-Related Conditions-III (NESARC-III), a large nationally representative sample of adults in the USA, to examine the associations of the most commonly occurring, and co-occurring, DSM-5 SUD (AUD, CUD, TUD) with three commonly assessed forms of childhood IPV: physical and sexual abuse, and witnessing parental violence. Toward the aim of teasing apart the specific contribution of childhood IPV to AUD, CUD, and TUD, we also examine the role of parental alcohol and drug use problems, as well as commonly co-occurring substance use and psychiatric disorders. We hypothesize that racial/ethnic and gender differences in rates of exposure to childhood IPV, and in rates of SUD, as well as co-occurring factors such as parental history of substance use problems or participant’s mental health problems, may contribute to differences in the associations of childhood IPV and adult SUD.
Methods
Sample
The NESARC-III target population was the non-institutionalized civilian population of adults (ages 18–65 years) in households and selected group quarters (Grant et al. 2015). Respondents were selected through multistage probability sampling, including primary sampling units (counties/groups of contiguous counties), secondary sampling units (groups of census-defined blocks), and tertiary sampling units (households within secondary sampling units), with NH Black, Asian, and Hispanic Americans oversampled. Data were collected from April 2012 to June 2013 and were adjusted for nonresponse and weighted to represent the US population based on the 2012 American Community Survey (Grant et al. 2015). The total sample size was 36 309: the household response rate was 72%, the person-level response rate was 84%, and the overall response rate was 60.1%, comparable with the rates in other current US national surveys (Substance Abuse and Mental Health Services Administration, 2014 report). NESARC-III sample characteristics are presented elsewhere (Grant et al. 2015). Informed consent was electronically recorded; respondents received $90.00 for participation. Institutional review boards at the National Institutes of Health and Westat (NESARC-III contractor) approved the study protocol.
All NESARC participants were asked if they are of ‘Hispanic or Latino origin.’ Next, participants were asked to select one or more categories to describe their race. Response options included: ‘American Indian or Alaska Native’, ‘Asian’, ‘Black or African American’, ‘Native Hawaiian or Other Pacific Islander’, and ‘White’. Of 36 309 participants, 19 194 self-identified as ‘non-Hispanic or Latino’ and ‘White’, 7766 self-identified as ‘non-Hispanic or Latino’ and ‘Black or African-American’, 7037 self-identified as ‘Hispanic or Latino,’ 499 self-identified as ‘American Indian or Alaska Native,’ and 1781 self-identified as ‘Asian’ or ‘Native Hawaiian or Other Pacific Islander’ for a total of 36 073 participants. Of this sample, 56.3% were female, with an age range of 20–90 (M = 45.5, s.d. = 17.5). We acknowledge that one’s racial, ethnic, and cultural identity are complex entities. Throughout this paper we describe one’s self-report of these identities (as described above) as race/ethnicity. Further, we will describe those who self- identified as ‘non-Hispanic or Latino’ and ‘White’ as non-Hispanic White (White) and those who self- identified as ‘non-Hispanic or Latino’ and ‘Black’ as non-Hispanic Black (Black). Those who identified as ‘Hispanic or Latino’ will be described as Hispanic, those who identified as ‘American Indian or Alaska Native’ will be described as American Indian, and those who identified as ‘Asian’ or ‘Native Hawaiian or Other Pacific Islander’ will be described as Asian.
Measures
Substance use and psychiatric disorders
The NIAAA Alcohol Use Disorder and Associated Disabilities Interview Schedule–V (AUDADIS-V; Grant et al. 2015) measures DSM-5 AUD, CUD, TUD, and selected psychiatric disorders in past year and prior to the past year. Each DSM-5 SUD diagnosis requires at least two of 11 criteria within a 12-month period. Within each SUD considered, 12-month and prior diagnoses were aggregated to form lifetime diagnoses. Test-retest reliabilities were moderate to substantial for these disorders (κ = 0.40–0.87) and their criteria scales (ICC = 0.45–0.84) (Grant et al. 2015). Concordance between AUDADIS-5 and PRISM-5 for SUDs was fair to substantial (κ = 0.36–0.66; ICC = 0.68–0.91) (Hasin et al. 2015). Additional DSM-5 disorders included in this study were: primary major depression, generalized anxiety, and antisocial personality disorder, as these disorders are most consistently co-morbid with SUD (Cerda et al. 2008; Hasin et al. 2015). Post-traumatic stress disorder, and adult IPV exposure (binary measure of any violent trauma exposure experienced after age18) were also included given the documented relation of childhood IPV, adult IPV, and PTSD (Koenen et al., 2007). The reliability and validity of these diagnoses in the NESARC-III were fair to moderate (Grant et al. 2015; Hasin et al. 2015).
Parental histories of problems with alcohol and drugs were ascertained using the AUDADIS-V. In assessing family history, interviewers read definitions to respondents that included examples of observable manifestations of the diagnostic criteria, since these are the most likely to be known to family members, increasing sensitivity (Andreasen et al. 1977; Zimmerman et al. 2004; Heiman et al. 2008). Interviewers then asked whether respondents’ biological mother and father experienced the condition as defined. From this information, separate variables were created representing parental (either biological mother or father) histories of alcohol and drug problems.
Childhood IPV
Ten items adapted from two empirically validated scales (Straus, 1979, 1990; Wyatt, 1985) were used to assess physical and sexual abuse, and witnessing parental/domestic violence before age 18. Scales of these items have excellent reliability [intraclass coefficients, 0.79–0.88 (Ruan et al. 2008)]. A three-factor model with a latent dimension indexing each IPV type provided an excellent fit to the data [Comparative Fit Index (CFI (Bentler, 1990)]: 0.96, Tucker-Lewis Index [TLI (Tucker & Lewis, 1973)]: 0.89, RMSEA (Root Mean Square Error of Approximation): 0.05).
Physical Abuse was assessed with the following questions: (1) How often did a parent or other adult living in your home push, grab, shove, slap or hit you? (2) How often did a parent or other adult living in your home hit you so hard that you had marks or bruises or were injured? Response options ranged from never (0) through very often (5). Sexual Abuse was assessed with the following questions: How often an adult engaged in the following when the respondent either did not want them to or was too young to know what was happening: (1) Touch or fondle you in a sexual way when you didn’t want them to or when you were too young to know what was happening? (2) Have you touched their body in a sexual way when you didn’t want to or you were too young to know what was happening? (3) Attempt to have sexual intercourse with you when you didn’t what them to or you were too young to know what was happening? (4) Actually have sexual intercourse with you when you didn’t want them to or you were too young to know what was happening? Response options ranged from never (0) through very often (5). Witnessing parental violence was assessed with the following questions: How often did your father, stepfather, foster or adoptive father or mother’s boyfriend do ANY of these things to your mother, stepmother, father’s girlfriend, or your foster or adoptive mother: (1) Push, grab, slap or throw something at her? (2) Kick, bite, hit her with a fist, or hit her with something hard? (3) Repeatedly hit her for at least a few minutes? (4) Threaten her with a knife or gun or use a knife or gun to hurt her? Response options ranged from never true (0) through very often true (5). While we acknowledge that this variable assesses violence on behalf of the participant’s father figure (or mother’s partner) towards mother figure (or father’s partner), herein we refer to this variable as ‘parental violence.’
Statistical analyses
All analyses were conducted in Mplus version 7.4 (©Muthén & Muthén, 1998–2015), with all estimates, weights, and standard errors adjusted for the complex sample design of the NESARC survey. Missing data were addressed via full-information maximum likelihood. A model (Fig. 1) that assessed the main effects of three types of childhood IPV (physical abuse, sexual abuse, witnessing parental violence, and their covariance) on three substance use disorders (AUD, CUD, TUD, and their covariance) was evaluated. All models included the following covariates: age, gender, race/ethnicity, household income, employment status, level of education, and marital status (N: 36 073, Number of Free Parameters (NP): 30, Loglikelihood (LL): −47 820.55,Akaike’s Information Criterion [AIC; (Akaike, 1976)]: 95 701.011, Bayesian Information Criterion (BIC): 9596.006). Secondary models also included parental alcohol and drug use problems and participants’ comorbid MDD, GAD, ASPD, adult trauma exposure, and PTSD (N: 36 073, NP: 45, LL: −46 164.835, AIC: 92 421.670, BIC: 92 804.163). Tertiary models included multiplicative interactions among race/ethnicity, gender, and each type of childhood IPV (i.e. race/ethnicity × IPV; gender × IPV; race/ethnicity × gender × IPV) to test for statistical differences in associations among each childhood IPV and each SUD observed across race/ethnic and gender groups (N: 36 073, NP: 54, LL: −46 143.899, AIC: 92 395.798, BIC: 92 854.790). Main and interaction effects are presented in Table 1. To further understand the variation across race/ethnic and gender groups underlying interaction effects observed, associations and adjusted associations stratified by race/ethnicity and gender are presented in Table 2.
Table 1.
OR | 95% CI | p Value | ||
---|---|---|---|---|
DSM-5 Alcohol Use Disorder | ||||
Physical Abuse | 1.32 | 1.25 | 1.39 | <0.0001 |
Sexual Abuse | 1.10 | 1.07 | 1.34 | 0.007 |
Parental Violence | 1.07 | 1.03 | 1.11 | 0.001 |
Sexual Abuse × Race/Ethnicity | 1.01 | 0.99 | 1.03 | 0.171 |
Physical Abuse × Race/Ethnicity | 1.01 | 0.99 | 1.03 | 0.222 |
Parental Violence × Race/Ethnicity | 1.03 | 1.01 | 1.05 | 0.007 |
Sexual Abuse × Gender | 1.03 | 0.95 | 1.11 | 0.545 |
Physical Abuse × Gender | 0.90 | 0.85 | 0.96 | 0.001 |
Parental Violence × Gender | 1.08 | 1.01 | 1.15 | 0.016 |
Sexual Abuse × Race × Gender | 1.01 | 1.00 | 1.02 | 0.119 |
Physical Abuse × Race × Gender | 1.00 | 0.99 | 1.01 | 0.586 |
Parental Violence × Race × Gender | 1.02 | 1.01 | 1.03 | <0.0001 |
DSM-5 Cannabis Use Disorder | ||||
Physical Abuse | 1.38 | 1.26 | 1.47 | <0.0001 |
Sexual Abuse | 1.14 | 1.08 | 1.26 | <0.0001 |
Parental Violence | 1.03 | 0.94 | 1.07 | 0.145 |
Sexual Abuse × Race/Ethnicity | 1.00 | 0.97 | 1.03 | 0.864 |
Physical Abuse × Race/Ethnicity | 1.02 | 0.99 | 1.05 | 0.218 |
Parental Violence × Race/Ethnicity | 1.02 | 0.99 | 1.05 | 0.180 |
Sexual Abuse × Gender | 0.92 | 0.83 | 1.01 | 0.075 |
Physical Abuse × Gender | 0.95 | 0.87 | 1.04 | 0.240 |
Parental Violence × Gender | 0.99 | 0.90 | 1.09 | 0.819 |
Sexual Abuse × Race × Gender | 0.99 | 0.98 | 1.01 | 0.405 |
Physical Abuse × Race × Gender | 1.01 | 0.99 | 1.02 | 0.568 |
Parental Violence × Race × Gender | 1.01 | 1.00 | 1.03 | 0.185 |
DSM-5 Tobacco Use Disorder | ||||
Physical Abuse | 1.32 | 1.25 | 1.38 | <0.0001 |
Sexual Abuse | 1.13 | 1.08 | 1.21 | <0.0001 |
Parental Violence | 1.14 | 1.10 | 1.22 | <0.0001 |
Sexual Abuse × Gender | 1.06 | 0.97 | 1.14 | 0.187 |
Physical Abuse × Gender | 0.91 | 0.86 | 0.96 | 0.001 |
Parental Violence × Gender | 0.99 | 0.92 | 1.06 | 0.711 |
Sexual Abuse × Race/Ethnicity | 0.99 | 0.97 | 1.01 | 0.314 |
Physical Abuse × Race/Ethnicity | 1.00 | 0.98 | 1.02 | 0.831 |
Parental Violence × Race/Ethnicity | 0.99 | 0.97 | 1.01 | 0.274 |
Sexual Abuse × Race × Gender | 1.00 | 0.99 | 1.01 | 0.627 |
Physical Abuse × Race × Gender | 0.99 | 0.98 | 1.00 | 0.218 |
Parental Violence × Race × Gender | 0.99 | 0.98 | 1.01 | 0.350 |
Bold significance: p < 0.05.
Reference Groups: Male Gender, NH White Race/Ethnicity, NH White Males.
Table 2.
Males | Females | All | Males | Females | All | Males | Females | All | |
---|---|---|---|---|---|---|---|---|---|
Physical Abuse | |||||||||
1.21*** | 1.13*** | 1.17*** | 1.21*** | 1.17*** | 1.19*** | 1.23*** | 1.14*** | 1.18*** | |
1.21*** | 1.15*** | 1.17*** | 1.21*** | 1.19*** | 1.20*** | 1.26*** | 1.14*** | 1.19*** | |
1.26*** | 1.12* | 1.19*** | 1.21* | 1.08* | 1.16* | 1.19** | 1.22*** | 1.20*** | |
1.31*** | 1.08 | 1.17*** | 1.23 | 1.24* | 1.22** | 1.19** | 1.05 | 1.11** | |
0.96 | 0.99 | 1.00 | 1.08 | 1.05 | 1.01 | 0.87 | 1.35* | 1.14 | |
1.33 | 1.43 | 1.36** | 1.95*** | 1.26 | 1.77*** | 1.19 | 1.26 | 1.20 | |
Sexual Abuse | |||||||||
0.98 | 1.04* | 1.02 | 1.11* | 1.05 | 1.06* | 1.00 | 1.09*** | 1.06*** | |
0.95 | 1.04 | 1.02 | 1.11 | 1.05 | 1.06 | 0.98 | 1.12 | 1.08*** | |
1.01 | 1.04 | 1.03 | 0.99 | 1.13* | 1.07 | 1.05 | 1.01 | 1.03 | |
1.11 | 1.08* | 1.07* | 1.17 | 0.91 | 0.99 | 1.10 | 1.05 | 1.05 | |
1.78 | 0.90 | 0.87 | 2.72* | 0.94 | 1.01 | 1.50 | 0.93 | 1.01 | |
0.91 | 0.99 | 0.95 | 0.86 | 1.25 | 1.12 | 0.94 | 1.07 | 0.99 | |
Parental Violence | |||||||||
0.92** | 1.03 | 0.98 | 0.94 | 0.96 | 0.95* | 1.08** | 1.10*** | 1.09*** | |
0.87** | 1.00 | 0.95 | 0.90* | 0.91* | 0.91** | 1.11* | 1.12*** | 1.11*** | |
0.97 | 1.02 | 0.99 | 1.08 | 1.01 | 1.04 | 1.01 | 1.05 | 1.04 | |
0.93 | 1.10** | 1.04 | 0.90 | 0.99 | 0.95 | 0.99 | 1.06 | 1.04 | |
1.85** | 1.04 | 1.23* | 1.34 | 1.33* | 1.29* | 1.77** | 1.35** | 1.39*** | |
0.98 | 1.06 | 1.06 | 1.02 | 0.86 | 0.88 | 1.24 | 1.11 | 1.18 |
Note: All models included the following covariates: age, gender, race/ethnicity (in combined models only), household income, employment status, level of education, and marital status. Secondary models also included parental alcohol and drug use problems and participants’ comorbid MDD, GAD, ASPD, adult trauma exposure, and PTSD.
p < 0.05;
p < 0.001;
p < 0.0001.
Results
Rates of DSM-5 SUDs by race/ethnicity and gender
Rates of lifetime disorders by race/ethnicity and gender have been reported previously for AUD (Grant et al. 2015), CUD (Hasin et al. 2016), and TUD (Chou et al. 2016). Overall, rates of lifetime SUDs are highest among White and American-Indian men, and lowest among Asian-American women (online Supplementary Fig. S1).
Childhood physical abuse
Among all participants, childhood physical abuse was reported by35.5% of the sample. Rates and frequency varied by race/ethnicity and gender (Table 3); compared with Whites (women: 34.6%; men: 40.2%), rates of physical abuse were significantly higher among American Indian participants (women: 46.5%; men:51.0%), and lower among Asian-American women (24.8%). In the full sample (race/ethnicity and gender as covariates), more frequent exposure to physical abuse was associated with AUD [OR 1.3, adjusted OR (aOR) 1.2]. Interactions with race/ethnicity ( p: 0.222) and race/ethnicity × gender were non-significant ( p: 0.586). However, there was a significant interaction with gender ( p <0.001), wherein greater associations were observed among males (males OR 1.4, females OR 1.3) (Fig. 2). In the full sample, more frequent exposure to physical abuse was associated with CUD (OR 1.4, aOR 1.2). Interactions with race/ethnicity ( p: 0.218), gender ( p: 0.240) and race/ethnicity × gender were non-significant ( p: 0.568). In the full sample, physical abuse was associated with TUD (OR 1.3, aOR 1.2). Interactions with race/ethnicity ( p: 0.831) and race/ethnicity × gender were non-significant ( p: 0.218). However, there was a significant interaction with gender ( p < 0.001) wherein greater associations were observed among males (males OR 1.4, females OR 1.2).
Table 3.
N | % any | Mean | s.d. | % any | Mean | s.d. | % any | Mean | s.d. | |
---|---|---|---|---|---|---|---|---|---|---|
Females | ||||||||||
NH White | 10 575 | 34.6 | −0.005 | 1.021 | 18.6 | 0.110 | 1.175 | 16.9 | −0.004 | 0.999 |
NH Black | 4577 | 32.6 | −0.017 | 0.997 | 21.2 | 0.142 | 1.274 | 15.3 | 0.109 | 1.162 |
American Indian | 299 | 46.5 | 0.368 | 1.353 | 29.6 | 0.737 | 2.057 | 20.6 | 0.374 | 1.486 |
Asian | 943 | 24.8 | −0.212 | 0.734 | 14.2 | −0.140 | 0.633 | 7.3 | −0.124 | 0.759 |
Hispanic | 3921 | 31.5 | 0.031 | 1.124 | 22.1 | 0.134 | 1.206 | 16.3 | 0.155 | 1.272 |
Males | ||||||||||
NH White | 8509 | 40.2 | 0.010 | 0.956 | 15.9 | −0.163 | 0.572 | 6.2 | −0.095 | 0.809 |
NH Black | 3123 | 37.9 | 0.048 | 0.985 | 17.7 | −0.099 | 0.822 | 6.9 | −0.030 | 0.922 |
American Indian | 208 | 51.0 | 0.455 | 1.365 | 20.0 | −0.115 | 0.658 | 9.1 | 0.169 | 1.202 |
Asian | 845 | 35.4 | −0.096 | 0.782 | 13.4 | −0.205 | 0.338 | 5.3 | −0.177 | 0.582 |
Hispanic | 3073 | 33.5 | −0.050 | 0.928 | 19.0 | −0.165 | 0.532 | 5.9 | −0.009 | 0.938 |
Childhood sexual abuse
Among all participants, sexual abuse was reported by 18.5% of the sample. Rates and frequency varied by race/ethnicity and gender (Table 3); sexual abuse was more frequently endorsed females regardless of race/ethnicity, and by American Indian participants (women: 29.6%; men: 20.0%) and less frequently endorsed by Asian Americans (women: 14.2%; men: 13.4%). Among all participants, more frequent exposure to sexual abuse was associated with AUD (OR 1.1, aOR: null), and associations did not differ significantly by race/ethnicity ( p: 0.171), gender ( p: 0.545) or race/ ethnicity × gender ( p: 0.119). Among all participants, more frequent exposure to sexual abuse was associated with CUD (OR1.1, aOR: 1.1), and associations did not differ significantly by race/ethnicity ( p: 0.864), gender ( p: 0.075), or race/ethnicity × gender ( p: 0.185). Among all participants, more frequent exposure to sexual abuse was associated with TUD (OR 1.1, aOR:1.1), and associations did not differ significantly by race/ethnicity ( p: 0.314), gender ( p: 0.187), or race/ethnicity × gender ( p: 0.627).
Parental violence
Among all participants, exposure to parental violence was reported by 11.8% of the sample. Rates and frequency varied by race/ethnicity and gender (Table 3); overall rates and frequency of parental violence were greater for females and among American Indian males (22.3%), and lower among Asian Americans (6.4%). The frequency of exposure to parental violence was associated with AUD (OR 1.1, aOR: null). The magnitude of these associations differed significantly by race/ethnicity ( p <0.001; White OR: null, Black OR: null, Hispanic OR 1.1, American Indian OR 1.3, Asian OR: null), gender ( p: 0.016; males OR 1.0, females OR 1.1), and race/ethnicity by gender ( p < 0.001) (Fig. 3); statistically significant associations of parental violence and AUD were only observed among Hispanic (OR 1.2, aOR 1.1), Black (OR 1.1, aOR: null), and White (OR 1.1, aOR: null) females, and American Indian males (OR 1.8, aOR 1.9). The frequency of exposure to parental violence was not associated with CUD in the full sample (Table 2), and associations did not differ significantly by race/ethnicity ( p: 0.180), gender ( p: 0.819) or race/ethnicity × gender ( p: 0.185). The association of parental violence and CUD was only present among Black males in unadjusted models (OR 1.2, aOR: null) and American Indian females (OR 1.4, aOR 1.3). The frequency of exposure to parental violence was associated with TUD (OR = 1.1, aOR 1.1). Associations did not differ significantly by race/ethnicity ( p: 0.274), gender ( p: 0.711) or race/ethnicity × gender ( p: 0.350).
Discussion
Findings from this study suggest that there are independent contributions of childhood physical and sexual abuse to AUD, CUD, and TUD, and of witnessing parental violence to AUD and TUD. Overall, associations of all childhood IPVs and SUDs were relatively similar across race/ethnicity and gender (ORs ranged from 1.1 to 1.9). However, interaction analyses indicated that there is modest heterogeneity in the associations of witnessing parental violence with AUD, such that this association is only observed among White, Black, and Hispanic females and American Indian males (and only among Hispanic females and American Indian males in adjusted models). In addition, gender moderates associations of physical abuse with AUD and TUD (increased risk among males), and of parental violence and AUD (increased risk among females). We note, however, that differences in all effect sizes are modest.
Childhood physical abuse
Exposure to physical abuse prior to age 18 was associated with increased odds of AUD, CUD, and TUD; the magnitude of these associations did not appear to differ significantly by race/ ethnicity. This supports previous studies that show physical abuse experienced early in life is a significant risk factor for alcohol, cannabis, and tobacco use problems (Fuller-Thomson et al. 2016). In addition, variation by gender was observed for AUD and TUD, such that associations of CPA with AUD and TUD were generally greater among males than females. We note that these effects are modest (1.4 for males v. 1.3 for females), and hypothesize that greater ORs may be due to the higher rates of SUDs and greater frequency of physical abuse endorsed by males compared with females in this sample. Previous studies examining gender differences in the relations of childhood IPV and SUD have produced mixed results (Kristman-Valente & Wells, 2013), with the largest and most comparable study (Fuller-Thomson et al. 2016) indicating no significant gender differences in the associations of CPA with alcohol or drug dependence. The authors offered several explanations for their findings that may also apply to the current study, including the use of retrospective self-report, which may result in more conservative findings, and the potential influence of cohort effects, whereby the negative stigma surrounding women’s substance use has become less salient. Consequently, more women are thought to be using substances, potentially developing AUD, thus leading to a “washing out” of the effect (Kristman-Valente & Wells, 2013). Continued investigation of gender moderation is required, with special attention given to potential cohort effects.
Childhood sexual abuse
Across race/ethnicity and genders, CSA was associated with elevated risk for AUD, CUD, and TUD. This is in agreement with several previous studies that link CSA to risk for SUD, even after taking into account other known shared risk factors (Kendler et al. 2000; Sartor et al. 2012). Interestingly, the relation of CSA and AUD was no longer significant after adjusting for other risk factors and psychiatric comorbidities among most groups (e.g. White and Black women), yet remained among Hispanic females, indicating robust CSA associated risk for AUD. Similarly, adjusted associations of CSA and CUD were no longer significant among most groups (e.g. White men and women, Hispanic men, and Asian women), yet remained among Black females and American Indian males, indicating robust CSA associated risk for CUD among these groups. In a review of the literature regarding the sociocultural context for mental health effects of sexual assault for AA, Asian-American, Latina, and Native-American women, Davis et al. 2008 discuss numerous barriers to obtaining protection and assistance that ethnic minority women are confronted with, including discriminatory policies, financial constraints, social stigma around mental health issues, and mistrust of agencies based on personal and historical experiences of violations. Future research should consider the mediating role of these factors in SUD risk among those exposed to CSA.
Parental violence
Across race/ethnicity and genders, exposure to parental violence was associated with increased odds of AUD and TUD, and after adjusting for other risk factors and psychiatric comorbidities, only TUD. Associations among parental violence with AUD and TUD also differed by gender, and for AUD also differed by race/ethnicity, and by race/ethnicity and gender. Witnessing parental violence in childhood has been linked to mental health and substance use problems throughout the life-course (Howell et al. 2014), and some prior evidence supports similar gender differences. Schiff et al. (2014) found that offspring of women experiencing IPV were more likely to manifest AUD, CUD, and TUD in young adulthood. Similar to the current study’s findings, stronger associations of witnessing IPV and AUD were observed among females. Smith et al. (2010) reported that adolescent exposure to IPV predicted increased odds of AUD (and depression) in early adulthood among females. Results from the current study extend this previous research in demonstrating associations of the frequency of exposure to parental violence and adult AUD and TUD across various racial/ethnic and gender groups in the US general population.
Associations of parental violence and AUD were relatively similar across race/ethnicity (statistically significant ORs ranged from 1.1 to 1.9). However, statistically significant group differences in the associations of parental violence and AUD were observed; increased risk for AUD was observed for White (OR 1.1), Black (OR 1.1), and Hispanic women (OR 1.2), and American-Indian men (OR 1.8). In adjusted models, however, only associations among Hispanic women (aOR 1.1) and American Indian men (aOR 1.9) remained. Previous studies have found that women and racial/ethnic minorities are more commonly exposed to domestic and/or partner violence (Caetano et al. 2005; Cho, 2012; Clark et al. 2016) although, other research suggests these group differences in exposure to IPV are no longer present when socioeconomic factors are taken into account (Klevens et al. 2007; Bonomi et al. 2009; Cho, 2012). In the present study, female participants and American-Indian males report increased rates of exposure to parental violence. These findings must be interpreted in the context of the father-figure towards mother-figure direction embedded within these variables since previous studies have shown that the gender of the perpetrator, and attitudes regarding gender and violence, both impact the influence of parental violence on behavior (Temple et al. 2013; Howell et al. 2014). Increased rates of exposure to partner violence may contribute to more normative views of domestic and partner violence (Cunradi et al. 1999; Caetano et al. 2000, 2001; Cunradi & Caetano, 2002), which together with limited access to mental health services (Krishnan et al. 2001; Lipsky et al. 2006) may decrease the likelihood of treatment services following traumatic exposure and increase risk for AUD. While exposure to parental violence clearly has adverse mental and physical health consequences for all groups, exposure to father-figure towards mother-figure violence may be a particularly potent negative life event that increases the risk for adult AUD among women, and ethnic/minority groups with extremely high rates of exposure (e.g. American Indians). More research is needed to understand the relation between parental violence and SUD in racial/ethnic minority groups, and to identify factors explaining these differences beginning to emerge in epidemiological research, including norms regarding domestic and partner violence and accessibility of mental health resources following trauma exposure.
Strengths and limitations
The following limitations should be considered. First, NESARC diagnostic interviews were administered by trained lay interviewers rather than clinicians, which has the potential to decrease the validity and reliability of measurement via false-negative diagnoses (Eaton et al. 2000). This concern is somewhat mitigated by the AUDADIS’s structured design (Hasin & Paykin, 1999). Second, this is a cross-sectional study, which limits causal inferences. Third, retrospective self-reports may be unstable over time (Fergusson et al. 2000; Polanczyk et al. 2009), typically underestimating trauma exposure prevalence, potentially biasing this study’s findings towards the null. Additionally, participants’ perceptions of how stressful each childhood IPV exposure was not measured. Fourth, race/ethnicity categories were based on US census options, categorizing heterogeneous populations as five homogeneous groups. Fifth, as noted above, parental violence assesses violence on behalf of the participant’s father figure (or mother’s partner) towards mother figure (or father’s partner), and therefore excludes mother-on-father figure violence, and other non-traditional familial structures (e.g. mother-on-mother or father-on-father violence).
These limitations are counterbalanced by several study strengths. As described above, the clustering of adverse childhood experiences, and adult psychopathology, makes disentangling the specific effects of any individual risk factor to any particular SUD is extremely challenging. In the current study, we used a large US representative sample, and an analytic model that enabled the examining of variables simultaneously, to explore the relations between childhood IPV and SUD in different racial/ethnic and gender groups. The NESARC-III is the largest and most recent psychiatric epidemiological survey of the US general population conducted to date, with data available on childhood trauma and a range of SUDs, and adequate representative qualities to examine associations of childhood IPV exposures, AUD, CUD, and TUD among participants of diverse racial/ethnic backgrounds, incorporating co-occurring risk factors and relevant socio-demographic characteristics.
Both a strength and limitation of the current study was full consideration of Asian-American and American-Indian participants as distinct race/ethnicity groups. Because of smaller population sizes, epidemiological studies typically focus on White, Black, and Hispanic groups, and include smaller numbers of members from other groups (i.e. Asian American, Native American, Native Hawaiian, other Pacific-Islanders). These individuals of are often pooled (i.e. ‘other’ race/ethnicity) or omitted from reports (Johnston et al. 2016). For these reasons, it is difficult to place specific findings within the context of previous studies. Although the current study included a sizable number of American Indian (N: 499) and Asian American (N: 1781) participants, the available sample was still small in comparison with other groups (N: 7037–19 194), limiting statistical power and our ability to comment conclusively on non-significant associations observed specifically among American-Indian and Asian- American participants, especially when analyses were further stratified by gender (i.e., comparable ORs but larger confidence intervals). Future studies would benefit from larger minority recruitment and examination of subpopulations within race/ethnic groups, including those who identify with more than one race/ethnic group.
Conclusions
In summary, findings from this study suggest that there are independent contributions of childhood physical and sexual abuse to AUD, CUD, and TUD, and of witnessing parental violence to AUD and TUD. Associations of all childhood IPVs and SUDs were relatively similar across race/ethnicity and gender, although associations of physical abuse with AUD and TUD were greater among males, and associations of parental violence and AUD were greater among females. Further, modest group differences in associations of parental violence with AUD indicated an increased risk for AUD among Hispanic women and American Indian men. This may reflect differing norms and rates of domestic violence and adult SUD among racial/ethnic and gender groups. Further research is needed to replicate and understand this finding. However, one clear implication is the importance of considering childhood trauma, culture, and gender in etiological models of SUD. When attempting to develop culturally appropriate intervention and prevention strategies, it is essential that mental health professionals understand the specific risk conferred by each IPV type and the specificity of that risk for SUD development across demographic characteristics. This research can inform efforts to tailor interventions specific to the individual – ensuring the content of such programs highlights populationspecific risk factors. Given the paucity of research in this area, and the potential for the identification of modifiable risk factors to lead to reductions in the impact of childhood IPV on SUDs, further research, and consideration of tailoring prevention and intervention efforts to different populations, is warranted.
Supplementary Material
Acknowledgements.
This research was funded by National Institute of Drug Abuse (K01DA037914, Meyers) and the New York State Psychiatric Institute (Hasin). K Werner is funded by National Institute of Drug Abuse (T32DA015035, Cunningham-Williams), and C Sartor is funded by National Institute on Alcohol Abuse and Alcoholism (AA023549, Sartor).
Footnotes
Supplementary material. The supplementary material for this article can be found at https://doi.org/10.1017/S0033291717003208
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