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. Author manuscript; available in PMC: 2019 Sep 14.
Published in final edited form as: Int J Methods Psychiatr Res. 2018 May 9;27(3):e1717. doi: 10.1002/mpr.1717

Female-male differences in alcohol dependence levels: Evidence on newly incident adolescent and young-adult drinkers in the United States, 2002-2014

Hui G Cheng 1, James C Anthony 1
PMCID: PMC6744833  NIHMSID: NIHMS1049396  PMID: 29745044

Abstract

Objective

In this study of newly incident drinkers (NID), we (1) investigate and calibrate measurement equivalence of seven clinical features of an alcohol dependence syndrome (ADS) across sex and age-of-onset subgroups, and (2) estimate female-male differences in ADS levels soon after taking the first full drink, with focus on those with first full drink before the 24th birthday.

Methods

The study population is 12-to-23-years-old newly incident drinkers living in the United States (US; n=33,561). Calibrated for measurement equivalence, male-female differences in levels of newly incident ADS are estimated for six age-of-onset subgroups.

Results

Measurement equivalence is achieved by dropping the ‘difficulty cutting down’ item. Then, among early-adolescent-onset NID, females have higher ADS levels (for 12-to-13-year-old NID: β = 0.25; 95% CI= 0.05, 0.45). In contrast, when drinking onset is delayed to adulthood, males have higher ADS levels (e.g., for 18-to-19-year-old NID: β = −0.27; 95% CI= −0.52, −0.02; for 20-to-21-year-old NID: β = −0.38; 95% CI= −0.65, −0.12).

Conclusions

In the US, there is female excess in ADS levels measured soon after drinking onset in early adolescence. The traditional male excess is seen when drinking onset occurs after mid-adolescence. Evidence from other countries will be useful.

Keywords: Alcohol Dependence Syndrome, Measurement Invariance, Male-Female Differences, United States

1. Introduction

Alcoholic beverages are among the most commonly consumed psychoactive drugs worldwide and in the United States (US; e.g., Degenhardt et al., 2008; Wilsnack et al., 2000). According to recent US estimates, 50% of adolescents have taken a first drink by the age of 16 years, and approximately 90% of individuals have had a first drink by the age of 21 years (Cheng, Cantave, & Anthony, 2016a). Among newly incident drinkers, roughly three percent (3%) develop an alcohol dependence syndrome (ADS) within 12 months after the first full drink (Cheng, Chandra, Alcover, & Anthony, 2016; Lopez-Quintero et al., 2011).

1.1. Female-Male Difference in Alcohol Drinking and Dependence

Female-male differences (FMD) have been central in alcohol research. FMD issues first surfaced in discussions of measurement of alcohol problems in early social research on drinking norms for men versus women. Early evidence substantiated a ‘traditional male excess’ in the occurrence of drinking-related problems (e.g., Wilsnack, Wilsnack, Kristjanson, Vogeltanz-Holm, & Gmel, 2009). Newer evidence, mainly from the US, discloses a ‘narrowing of the gender gap’ in estimated prevalence of drinking and drinking-related problems (Keyes, Martins, Blanco, & Hasin, 2010; Slade et al., 2016).

Recently, with focus on the risk of becoming a newly incident drinker and the risk of making a rapid transition to problematic drinking, we found evidence that this traditional ‘gender gap’ might have closed in the US, with female excess of problems seen among early adolescents (US). That is, early-adolescent girls now are more likely to start drinking and are more likely to experience the first heavy drinking episode compared to early-adolescent boys in the US (Cheng & Anthony, 2016a, 2017; Cheng, Cantave, & Anthony, 2016b). There also is evidence favoring a female excess risk of rapid transition to alcohol dependence case status when alcohol dependence syndrome (ADS) is assessed as a diagnostic category, but issues of measurement equivalence have re-surfaced (Cheng, Chandra, et al., 2016).

1.2. Measurement Equivalence in Alcohol Dependence Syndrome Research

The origins of measurement equivalence research in psychiatric epidemiology generally can be traced back to the 1950s-70s when the “What is a case?” question was emphasized. This case definition question continues to be asked, and US diagnostic criteria now depart from DSM-IV, with resulting methods complexity for multi-country investigations (American Psychiatric Association, 1994; Demyttenaere et al., 2004; Wilsnack et al., 2000).

In its traditions of methods research, psychiatric research has been characterized by widespread appreciation that the sensitivity or specificity of diagnostic assessment tools might not be consistent for population subgroups. Examples of measurement non-equivalence can be found in many domains of neuropsychiatric assessment. To illustrate, in Grimby’s research on elders, roughly one-half of bereaved elderly said they had seen, heard, or talked to a loved one within one year after the death, but this experience ordinarily did not qualify as an example of Schneiderian first rank hallucinations (Grimby, 1993). Failure to spell “World” backwards or to recite the ‘serial sevens’ in the Mini-Mental State Examination can reflect lack of schooling, and may not be a manifestation of dementia, delirium, or related individual-level disease state .

Problems of measurement equivalence and non-equivalence are also relevant when psychiatric epidemiology’s focus shifts toward a dimensional conceptualization of psychiatric disturbances. For example, Gallo and colleagues re-approached the Diagnostic Interview Schedule (DIS) items used to assess major depression, and approached each DIS item as a manifestation of an underlying latent dimension (‘latent trait’) of depression. Working within this dimensional framework, they found that with depression level held constant, elders (age 65 years and older) were less likely than non-elders (18–64 year olds) to experience a crucial manifestation of depression (i.e., long-sustained feelings of being ‘sad, blue, or depressed’; Gallo, Anthony, & Muthén, 1994).

The parallel tradition of methods research on alcohol shows recognition that ADS might show gendered manifestations, as well as age-of-onset variations (Demyttenaere et al., 2004; Kuhn, 2015; Robins & Cottler, 2004; Schulte, Ramo, & Brown, 2009; Wilsnack & Wilsnack, 1992). For example, some ADS manifestations (e.g., withdrawal) might be highly discriminating for adult drinkers, but less discriminating among early-adolescent drinkers (Harford et al. 2009).

A suggested ‘mechanism’ for this kind of measurement non-equivalence is that adult drinkers and early-adolescent drinkers can differ in their interpretation of ADS assessment items (Morgenstern, DiFranza, Wellman, Sargent, & Hanewinkel, 2016). For example, a ‘binge’ might have one meaning for an adolescent and quite another meaning for older drinkers when no clear definition is provided.

We are not the first to draw attention to issues of this type in field studies of alcohol problems and related disturbances. Muthén and others have made measurement non-equivalence a recurring theme (Gallo et al. 1994; Muthén 1996; Caetano & Babor 2006; Gelhorn et al. 2008; Asparouhov & Muthén 2010; Keyes et al. 2010; Kim & Yoon 2011; Muthén & Asparouhov 2014). In brief, when the starting point is a unidimensional ADS construct with various items differentiating low vs. high ADS levels (slopes or discrimination parameters) at different locations along the ADS dimension (e.g., intercepts or difficulty parameters), it is possible to evaluate a full-variance (‘configural’) model, which allows the intercepts and slopes to vary across subgroups (e.g., males vs. females or age-of-onset groups), against an alternative specification of the full-equivalence (‘scalar’) model, which constrains the intercepts and slopes to be equal across subgroups. If evidence favoring measurement equivalence can be established by showing no appreciable difference between the ‘configural’ and ‘scalar’ model, a well-fitting ‘scalar’ model facilitates the interpretation of subgroup differences because item functioning parameters (such as intercepts and slopes) are held equal across subgroups (Kim & Yoon, 2011; Stark, Chernyshenko, & Drasgow, 2006). When measurement equivalence is neglected, any observed FMD or age-of-onset differences can be rendered tentative due to potential differential item functioning in males and females or across age-of-onset groups.

1.3. The Current Study

As mentioned above, the conventional approach toward investigation of FMD in alcohol problems has emphasized a view of alcohol problems measured in terms of discrete categories (e.g., heavy drinking episode; alcohol dependence syndrome; e.g., Cheng & Anthony, 2016b; Cheng, Chandra, et al., 2016; Keyes, Grant, & Hasin, 2008; Wilsnack et al., 2000). The complementary but different dimensional approach, as was advocated by Edwards and Gross, generally assumes ‘measurement equivalence.’ Re-cast using the latent trait approach, any underlying ADS dimension is tapped by diagnostic assessment items with essentially equivalent performance characteristics (e.g., intercepts, slopes) for all subgroups under study (Rose, Lee, Selya, & Dierker, 2012).

For this study, we completed a formal assessment of measurement equivalence in order to calibrate an ADS assessment. We then estimated FMD variations in the level of an ADS dimension in different age-of-onset age groups. This work can be distinguished from the just-cited work by Rose and colleagues (2012) in three ways: (a) our modeling is age-specific and probes for FMD in ADS levels when drinking starts at 12 to 13 years versus later in adolescence or young adulthood, with due attention to measurement equivalence across sex- and age-of-onset-groups; (b) we formally test for measurement equivalence in ADS (rather than assume measurement equivalence); and (c) we include all newly incident drinkers without restriction to persistence of drinking (i.e., without restriction to drinking during the past 30 days). To be clear, in this study, the elapsed time from the first drink until the ADS assessments is a short interval that never exceeds 12 months. We judge that this research approach constrains (but might not totally eliminate) recall and reporting measurement artifacts that have been found when ADS assessments occur after intervals of 2–3 years or longer (Engels, Knibbe, & Drop, 1997; Kuntsche, Rossow, Engels, & Kuntsche, 2016).

Against this background, the main aim of this study is to estimate female-male differences in the escalation of levels an alcohol dependence syndrome soon after drinking onset in adolescent and young-adult drinkers. Based on previous findings, our hypothesized expectations are (1) a male excess in the level of ADS, (specified as a dimensional construct,) in all age groups (Edwards, 1986; Edwards & Gross, 1976); and (2) a larger male excess among adult-onset drinkers compared to adolescent-onset drinkers. Alternatively, we consider the idea that larger ADS levels might be found for adolescent female drinkers, compared to adolescent male drinkers, within the first 12 months after drinking onset, in a pattern that reflects recent findings about incidence of becoming a case of categorically defined DSM-IV alcohol dependence in the adolescent female subgroup (e.g., Cheng et al., 2016a).

Our tight focus on newly incident drinkers represents a sustained attempt to shift focus in FMD research from prevalence differences to incidence differences. It also reflects our concern about early escalation of drinking problems. To the extent that FMD exist, effective public health or clinical tactics for underage female new drinkers will not necessarily be the same as tactics that work for new male drinkers during the post-drink interval when ADS clinical features start to emerge, perhaps before ADS levels progress to a fully formed syndrome.

2. Materials and Methods

2.1. Study Population and Sample

The study population is specified to represent almost all non-institutionalized civilian residents aged 12 years and above living in all 50 States and the District of Columbia of the United States (US), as sampled for National Surveys on Drug Use and Health (NSDUH), with field operations conducted from 2002 through 2014. Each NSDUH multi-stage probability sampling plan was designed to yield a nationally representative sample with oversampling of 12-to-17-year-olds. The NSDUH sampling frame included adolescents with no regard to school attendance, as well as non-household group quarters such as homeless shelters and college dormitories.

NSDUH participant recruitment is via child assent and parental or adult consent, based upon protocols approved by cognizant human subject protection committees. More than 30,000 12-to-23-year-old participants are included in each year’s NSDUH sample (United States, 2012).

Newly incident drinkers are those who consumed their first full drink during the 12 months prior to the assessment (Cheng, Chandra, et al., 2016). In aggregate, 34,455 12-to-23-year-old new drinkers were identified, among whom 894 (2.6%) individuals have missing values on all seven clinical features of DSM-IV alcohol dependence. Therefore, the analytic sample included 33,561 newly incident drinkers.

2.2. Assessment and measures

NSDUH confidential audio computer-assisted self-interviews (ACASI) assessed drinking histories, with questions for newly incident drinkers about the month and year when the first full drink was consumed. ACASI is used to promote reliability, accuracy, and truthfulness of participant reports about potentially sensitive behaviors and characteristics.

Key response variables measured in this study are seven pre-selected clinical features of alcohol dependence seen in many contemporary ADS case definitions: ‘tolerance’, ‘withdrawal’, ‘salience’, ‘difficulty cutting down’, ‘drinking more than intended’, ‘drinking despite physical or psychological problems’, and ‘giving up important activities for drinking’ (American Psychiatric Association, 1994). All items are measured on a binary scale (i.e., ‘yes’ or ‘no’) with options for ‘don’t know’ and refusal (‘don’t know’ and ‘refused’ were treated as missing values in analysis). Supplementary Table S1 lists NSDUH questions for assessment of each clinical feature. All individuals who consumed alcohol for at least six days during the 12 months prior to the assessment were asked questions about ADS clinical features. In this study, newly incident drinkers who consumed alcohol for fewer than six days are assumed to have experienced none of the ADS clinical features listed above (United States, 2014). We provide a more detailed discussion about this NSDUH measurement assumption in the online supplement.

Sex (male-female) and age generally are from the self-report self-interview. For the few respondents with non-valid sex and age items, NSDUH has drawn the information from the dwelling unit rostering information.

2.3. Analysis

For this study, we created 12 sub-groups based on sex and age at first full drink (i.e., males and female with age at first full drink at 12–13, 14–15, 16–17, 18–19, 20–21, and 22–23 years). After sample description, we tested measurement equivalence of the seven clinical features as observed variables for a latent ADS construct across these sex and age groups (Gelhorn et al., 2008; Jöreskog, 1971; Martin, Chung, Kirisci, & Langenbucher, 2006). We first used a confirmatory factor analysis model to assess goodness of fit of a one-dimension ADS latent construct for each of the 12 subgroups via the following fit indices: root mean square of approximation (RMSEA) (Steiger, 1990), comparative fit index (CFI) (Bentler, 1990), and Tucker-Lewis index (TLI) (Tucker & Lewis, 1973). Generally accepted rules of thumb are that an RMSEA< 0.05 and CFI/TLI>0.95 indicate reasonably good model fit (Hu & Bentler, 1999; B. O. Muthen, 1992), with all factor loadings (λ) greater than 0.40 (Ford, MacCallum, & Tait, 1986).

Next, the adjusted chi-square test was used to compare two nested models: the full equivalence (i.e., scalar) vs. full variance (i.e., configural) model (Kim & Yoon, 2011; Stark et al., 2006). A p-value <0.05 from the adjusted chi-square test served as our marker for measurement non-equivalence, which prompted inspection of intercepts and λ slopes to investigate any item with potential differential functioning (Stark et al., 2006). After dropping any item with differential functioning and re-checking of these measurement equivalence issues, we conducted a multiple-group analysis to estimate FMD in the level of ADS for each of the six age-of-onset groups, with weighted least squares mean and variance adjusted estimators for estimation (WLSMV; Asparouhov & Muthén, 2010). Exploratory analyses to test the assumption of missing completely at random for WLSMV and for greater memory error constraints are described in the supplementary material (Supplementary 1.2 and 1.3). In this study, NSDUH-constructed analysis-weights take into account differential selection probabilities and post-stratification adjustment factors.

3. Results

Table 1 reports estimated occurrence of each clinical feature for AD in each subgroup of newly incident drinkers. In all sex- and age-subgroups, ‘tolerance’ and ‘salience’ are the two most common AD clinical features observed within 12 months after first drink. Other clinical features are relatively rare (i.e., estimated occurrence <=2.0% in most groups). Among female new drinkers, estimated occurrence of AD clinical features drops with the age of first full drink, whereas no clear pattern is observed for males (Table 1).

Table 1.

Estimated sex-specific and onset-age-specific occurrence of individual DSM-IV alcohol dependence clinical features among 12-to-23-year-old newly incident drinkers. Data From the United States National Surveys on Drug Use and Health, 2002–2014 (Unweighted n=33,561).

Panel A. Females

Age at first full drink 12–13
(n=2,276)
14–15
(n=5,742)
16–17
(n=4,654)
18–19
(n=2,729)
20–21
(n=2,258)
22–23
(n=309)

Clinical feature % (se)* n* % (se)* n* % (se)* n* % (se)* n* % (se)* n* % (se)* n*

Salience 8.7 (0.8) 195 8.6 (0.5) 518 7.1 (0.5) 325 6.2 (0.6) 171 5.2 (0.6) 123 4.0 (1.6) 12
Drink more than intended 1.5 (0.4) 32 1.7 (0.2) 90 1.6 (0.2) 77 1.5 (0.3) 41 0.8 (0.2) 21 0.6 (0.3) 3
Subjectively felt tolerance 13.0 (1.0) 280 13.0 (0.6) 698 10.4 (0.6) 499 10.2 (0.8) 267 10.2 (0.9) 210 7.9 (2.3) 22
Withdrawal 3.6 (0.6) 60 1.6 (0.3) 94 1.1 (0.2) 50 0.9 (0.2) 20 1.1 (0.3) 26 0.4 (0.3) 3
Give up activities 1.9 (0.4) 44 1.6 (0.2) 99 1.8 (0.2) 81 1.0 (0.2) 31 0.9 (0.2) 22 1.7 (0.8) 5
Continue despite problems 3.3 (0.6) 67 2.1 (0.2) 126 2.0 (0.3) 95 2.0 (0.4) 57 0.9 (0.3) 22 0.9 (0.4) 4
Difficulty cutting down 1.8 (0.3) 36 1.4 (0.2) 79 0.9 (0.2) 49 1.1 (0.2) 37 0.9 (0.2) 17 0.3 (0.2) 2

Panel B. Males

Age at first full drink 12–13
(n= 1,753)
14–15
(n=4,703)
16–17
(n=4,606)
18–19
(n=2,529)
20–21
(n=1,809)
22–23
(n=193)

Clinical feature % (se)* n* % (se)* n* % (se)* n* % (se)* n* % (se)* n* % (se)* n*

Salience 4.9 (0.6) 94 6.1 (0.4) 298 6.9 (0.5) 315 8.8 (0.8) 199 7.7 (.9) 136 6.3 (2.1) 13
Drink more than intended 1.1 (0.3) 19 1.2 (0.2) 57 1.4 (0.2) 60 1.4 (0.4) 36 1.6 (.4) 32 0.6 (0.5) 2
Subjectively felt tolerance 11.1 (1.0) 182 13.3 (0.6) 580 12.2 (0.7) 540 15.3 (1.0) 379 13.7 (1.1) 239 15.1 (3.7) 23
Withdrawal 1.6 (0.4) 32 1.6 (0.3) 66 1.8 (0.3) 73 1.2 (0.4) 26 1.7 (.4) 24 2.6 (1.4) 4
Give up activities 1.1 (0.3) 18 1.0 (0.2) 47 1.1 (0.2) 53 1.3 (0.4) 31 1.0 (.3) 18 1.4 (1.0) 3
Continue despite problems 1.8 (0.4) 38 2.2 (0.3) 100 2.2 (0.3) 93 2.5 (0.5) 64 1.8 (.4) 39 1.9 (1.2) 3
Difficulty cutting down 2.0 (0.4) 34 1.2 (0.2) 47 1.3 (0.2) 49 1.2 (0.3) 34 1.3 (.3) 29 1.1 (0.8) 2
*

%, weighted cumulative incidence proportion and standard error; n, unweighted number of cases with each clinical feature

Fit indices for the CFA one-dimension AD model indicate good fit for all subgroups (Supplementary Table S1). In formal comparison of configural versus scalar modeling (all seven DSM-IV AD clinical features), the adjusted chi-square test favors the configural model over the scalar model (chi-square=74.6, df=65, p=0.040). Studying each intercept and λ estimate across subgroups, we observed considerable variation across subgroups in estimated λ for the ‘difficulty cutting down’ item. That slope estimate varies from 0.41 in 18-to-19-year-old males to 0.81 in 12-to-13-year-old males. With this item dropped, CFA modeling demonstrated a good fit for all subgroups (Supplementary Table S1), and scalar model measurement equivalence is supported (chi-square=48.387, df=44, p=0.300). The resulting six-item scalar equivalence model for the AD dimension among newly incident drinkers has favorable fit indices (RMSEA=0.013, 90% CI= 0.010, 0.017; CFI= 0.989; TLI= 0.988), and all loadings are >0.40.

Subsequent multiple-group analysis with ADS level measured by just six items disclosed a robust female-male difference among newly incident drinkers who had their first full drink at 12 or 13 years of age -- i.e., higher ADS level for females (β= 0.25, 95% CI= 0.05, 0.45). Then, FMD is null when drinking onset is at 14-to-15-years (β= 0.14, 95% CI= −0.02, 0.30), and at age 16–17 (β= 0.08, 95% CI= −0.07, 0.23). Thereafter, a robust male excess in ADS level emerges, as indicated by the negative sign on estimated β and both 95% bounds (18–19 year olds: β= −0.27, 95% CI= −0.52, −0.02; 20–21 year olds: β= −0.38, 95% CI= −0.65, −0.12; Figure 1).

Figure 1.

Figure 1.

Estimated female-male differences in the level of alcohol dependence across age groups among 12-to-23-year-old newly incident drinkers, based on six-clinical-feature alcohol dependence syndrome construct (reference group= males at the same age of first drink). Data from the United States National Surveys on Drug Use and Health, 2002–2014 (Unweighted n=33,561).

Figure 2 shows sex-specific variations in ADS level across age-of-onset subgroups, as observed within 12 months after the first full drink. ADS levels show no appreciable variation with age-of-onset for males. ADS level is largest for the youngest female newly incident drinkers, with an apparent downward shift in ADS level as we look across the female age-of-onset subgroups.

Figure 2. Estimated onset-age-specific differences in the level of alcohol dependence for male and female 12-to-23-year-old newly incident drinkers, based on 6-clinical-feature alcohol dependence syndrome construct. Data from the United States National Surveys on Drug Use and Health, 2002–2014 (Unweighted n=33,561).

Figure 2.

Panel 1. Females (n=17,968; reference: first full drink at 12–13 years of age). Panel 2. Males (n=15,593; reference: first full drink at 12–13 years of age).

Readers interested in estimates that hold constant the comparison group will find them in Supplementary Figure S1. In multiple-group analysis with all seven clinical features (no items dropped), the pattern of estimated FMD is congruent with the pattern shown in Figure 1 for our six-item model (Supplementary Figure S2), notwithstanding the apparent measurement non-equivalence problem when the seven-item approach is used.

4. Discussion

The novel finding of this study is a robustly larger ADS level among early adolescent female drinkers compared to males, observed within the first 12 months after the 1st full drink. In contrast, when drinking starts in early adulthood, there is a robust male excess in ADS levels. This shift in the valence of the female-male difference is not due to an age-related increasing ADS level for males. Rather, for the males, the ADS level observed within 12 months after the first full drink does not seem to vary appreciably with the age of drinking onset. Instead, robust FMD in early adolescence appear to be due to early adolescent female drinkers quickly progressing toward a relatively higher ADS level. Thereafter, looking across female newly incident drinkers, readers will see an age-related decline in ADS level such that there is no robust FMD at mid-adolescence, after which the male excess ADS level can be seen.

Our confidence in the FMD pattern is greater for the six-item assessment of ADS levels, which showed measurement equivalence properties. Nonetheless, our supplementary results show a similar FMD pattern with ADS level assessed via our original seven items. Whereas the ‘difficulty cutting down’ discrimination parameter estimate (λ) varies considerably across some subgroups (e.g., 0.81 versus 0.41), this manifestation of measurement non-equivalence apparently was not large enough to disrupt patterning of the FMD estimates in this sample.

Several important study limitations merit attention. The fact that the study is not longitudinal and is cross-sectional in its research design may seem troublesome, but counter-balanced strengths include (1) the nationally representative sampling with large numbers of newly incident drinkers across onset-ages of interest, (2) absence of sample attrition that almost always is present as a missing data mechanism in longitudinal research on ADS (e.g., see Morgenstern et al., 2016), and (3) elimination of measurement reactivity that is faced when the identical ADS assessment is presented to the same individual on multiple occasions (Anthony, 2010).

Another limitation involves the ‘gating’ of AD assessments in NSDUH. A more detailed discussion is presented in the supplementary material, but in brief, we note a plausible ‘measurement assumption’ that ADS level might be negligible among new drinkers with fewer than six separate days of alcohol consumption in the lifetime drinking history.

Finally, we draw attention to our conceptualization of AD as a dimensional variable and our deliberate omission of NSDUH items on ‘troubled drinking’ and social maladaptation secondary to alcohol experiences (e.g., getting into trouble with the family). Responses to the omitted items are heavily norm- and context-dependent and can create both conceptual and measurement difficulties in drug dependence research, especially in studies of ‘underage’ drinking and other ‘precocious’ drug onsets (Anthony, 2010; Edwards, 2012; Martin et al., 2006). An important example for research on female-male differences can be seen in what often is greater familial strife when it is the teen daughter who drinks on her own as opposed to the teen son who drinks on his own. Chung and colleagues draw attention to measurement issues of this type (Chung, Martin, Armstrong, & Labouvie, 2002). More importantly, this specification is consistent with the original ADS conceptualization in the Edwards-Gross tradition, which placed emphasis on clinical features of the type listed in Table 1, and did not stress alcohol-attributable social maladaptation (Edwards & Gross, 1976).

Notwithstanding limitations such as these, the study findings are of interest. Given that male and female newly incident drinkers at different ages can have different interpretations of the same word and might understand ADS concepts differently, it is reassuring to see measurement equivalence when ADS is measured using six of the seven ADS clinical features assessed in this study. One result should be a greater understanding of measurement issues previously discussed in research on subgroup variations in ADS levels among newly incident drinkers, but not addressed directly with measurement equivalence modeling (McBride & Cheng, 2011; Rose et al., 2012), and in future investigations.

Our discovery of ‘difficulty cutting down’ as a problematic ADS item merits some discussion. We cannot claim that this item should be dropped from ADS assessments in all instances; this might be problematic in early-adult newly incident drinkers specifically or perhaps just in the US. In this study with an extremely large sample across the normative drinking onset age distribution, we were able to detect age-of-onset-related variation in the latent structure’s λ parameter estimates for this item, but otherwise there was no substantial difference between the configural and scalar models we fit to the data. If future research confirms this kind of measurement issue with ‘difficulty cutting down’ items, a mixed methods approach is indicated, perhaps with questions about motivations for trying to cut down (e.g., to lose weight). Qualitative studies of underage newly incident drinkers should prove to be useful.

At this early stage of research on FMD among newly incident drinkers, speculation about origins of the observed variations in female-male differences of ADS level across age-of-onset subgroups should cover a broad range, including sex-specific genetic susceptibility traits, hormone levels regulating ethanol response, learned social roles and customs, as well as personality traits (Kuhn, 2015; Schulte et al., 2009). In a series of prior studies on newly incident drinkers in the US, we have found an early-adolescent female excess in drinking onset and in transitions from drinking to first heavy drinking episode (Cheng & Anthony, 2016b; Cheng, Cantave, et al., 2016b). For DSM-IV alcohol dependence framed as a categorical outcome, the early-adolescent FMD was not robust but favored a female excess (Cheng, Chandra, et al., 2016). It is not immediately clear whether the observed early-adolescent female excess in ADS level is determined by the same influences that shape these other drinking phenomena. It is possible that different mechanisms come into play in relation to these conceptually separable but empirically interdependent drinking behaviors and response variables.

Although we are left with an incomplete understanding of the observed variations in female-male differences in ADS levels across the age-of-onset gradient studied here, public health implications of drinking onsets during adolescence are clear. At least within the United States, the first year after drinking onset is an interval during which an ADS can start to emerge and to escalate (McBride & Cheng, 2011), with what might be faster escalation in ADS level for female newly incident drinkers in early adolescence, with male excess at later onset-ages. As such, the interval soon after drinking onset may be a crucial one for public health outreach and intervention. Early onset ADS is associated with poorer health and social outcomes, including specific consequences for young girls such as becoming unintentionally pregnant and risky sexual behaviors (Kandel, Chen, Warner, Kessler, & Grant, 1997; Moss, Chen, & Yi, 2014; Schuckit, 2009).

In the tobacco control field, the concept of “prevescalation” has been introduced to complement (1) “primary prevention” of newly incident smoking, as well as (2) “treatment” of already escalated smoking frequency and clinically recognizable tobacco dependence syndromes (Dishion & Andrews, 1995; Niaura, 2017; Piper et al., 2017). This concept of “prevescalation” also is pertinent in alcohol and other drug research and in public health program planning for newly incident users as they accumulate precursor, prodromal, or clinical features of dependence or addiction and move along dimensions toward fully formed syndromes. Here, we see that across all sex- and age-groups under study, ‘tolerance’ and ‘salience’ are the two most common clinical features encountered quickly after 1st full drink. When parents, peers, teachers, and pediatricians become aware that adolescents have started ‘drinking on their own’ and have been increasing their alcohol consumption or spending more time engaging in drinking-related activities, it may be time to ask questions about salience and tolerance, and to consider non-invasive brief interventions with a capacity to prevent an escalation toward the fully-formed AD syndrome as well as secondary AD-related consequences of the type just mentioned (Amaro et al., 2010). The observed distinctive female-male differences and age-of-onset patterns for ADS levels may signify a need to adapt public health interventions to different audiences and to modify the nature or intensity of interventions in relation to sex and age (Brady, Grice, Dustan, & Randall, 1993; Kuhn, 2015; Schulte et al., 2009).

Supplementary Material

Supplement

Acknowledgments

We are grateful to the United States Department of Health and Human Services, Substance Abuse and Mental Health Services Administration, Center for Behavioral Health Statistics and Quality, for making the data publicly available. This work was supported by the National Institute of Drug Abuse (NIDA T32DA021129 [HGC] and K05DA015799 [JCA]) and Michigan State University. We wish to thank Dr. Tenko Raykov and Dr. Orla McBride for their helpful comments and suggestions.

Financial support: The study is supported by funds from the National Institute on Drug Abuse grants K05DA015799 (to JCA), and T32DA021129 (to HGC), as well as Michigan State University. The content is the sole responsibility of the authors and does not necessarily represent the official views of MSU, the United States National Institute on Drug Abuse, or the United States National Institutes of Health.

Footnotes

Conflict of interest: none

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