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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: J Psychoactive Drugs. 2018 Sep 11;50(5):373–381. doi: 10.1080/02791072.2018.1514477

Characteristics of Prescription Opioid-impaired and Other Substance-Impaired Drivers in Rural Appalachian Kentucky

J Matthew Webster a, Megan F Dickson b, Faiyad Mannan c, Michele Staton a
PMCID: PMC6296382  NIHMSID: NIHMS1515065  PMID: 30204565

Abstract

Previous studies have highlighted the prescription opioid epidemic in rural Appalachia and its associated risk behaviors; however, no studies have examined prescription opioid-impaired driving as a consequence of this epidemic. The purpose of the present study was to describe prescription opioid-impaired drivers in rural Appalachian Kentucky and examine how they are similar to and different from other substance-impaired drivers from the region. A sample of convicted DUI offenders from rural Appalachian Kentucky completed a confidential research interview focused on their substance use, mental health, and criminal activity. Prescription opioid-impaired drivers (n=33) were compared to other drug-impaired drivers (n=29) and to alcohol only-impaired drivers (n=44). Overall, prescription opioid-impaired drivers had a similar prevalence of illicit substance use and criminal activity, including impaired driving frequency, to other drug-impaired drivers but had a higher prevalence of illicit substance use and more frequent impaired driving when compared to alcohol only-impaired drivers. Study implications include the importance of comprehensive substance abuse assessment and treatment for DUI offenders and the need for tailored interventions for prescription opioid-impaired and other drug-impaired drivers.

Keywords: prescription opioids, impaired driving, rural Appalachia

Introduction

The misuse of prescription opioids has become a national epidemic (Dart et al. 2015). Recent estimates from the National Survey on Drug Use and Health (NSDUH) indicate that 12.5 million Americans ages 12 and older misused prescription opioids in the past year with nearly 6000 new initiates each day (Substance Abuse and Mental Health Services Administration [SAMHSA] 2016). The prescription opioid epidemic has been linked to severe health consequences. For example, prescription opioid-related overdose deaths have quadrupled since 1999 (Centers for Disease Control and Prevention 2017). The need for services has also increased with the percentage of substance abuse treatment admissions for prescription opioid misuse and narcotic pain reliever-related emergency department visits approximately doubling in the past decade (SAMHSA 2017; Crane 2015).

Rural Appalachia has been found to be at particular high risk for prescription opioid-related problems (Zhang et al. 2008; Havens, Walker, and Leukefeld 2007). Rural Appalachian states such as Kentucky and West Virginia rank at or near the top in the U.S. in prescription opioid use disorders and treatment admissions (SAMHSA 2017; 2016) and overdose deaths (Kaiser Family Foundation 2017). Furthermore, injection drug use rates in rural Appalachia have risen sharply above national averages in conjunction with increased prescription opioid abuse and have led to increases in drug abuse-related infections (Staton et al. 2018; Havens et al. 2013). These consequences are compounded by the fact that many rural Appalachian areas are impoverished and lack, or offer limited, substance abuse treatment (Staton-Tindall et al. 2012). The shortage of substance abuse treatment (and health care provision, in general) coupled with a culture of self-reliance and distrust of outsiders in many Appalachian communities has resulted in particularly high rates of misuse and overdose of prescription medications, including prescription opioids, and high rates of unmet treatment need (Moody, Satterwhite, and Bickel 2017).

Despite the well-documented rural Appalachian prescription opioid problem and related health consequences, one unexamined effect of this epidemic is prescription opioid-impaired driving. Although there is evidence that individuals managed on therapeutic levels of prescription opioids may have limited impairment to their driving-related skills (Schumacher et al. 2017; Fishbain et al. 2003), other studies have shown prescription opioids can impede safe driving, especially under acute administration or in the context of opioid misuse (Zacny and Guiterrez 2009). Possible side effects include sedation, impaired concentration, and slowed information processing and reaction time, all of which decrease an individual’s ability to safely operate a motor vehicle (Vearrier et al. 2016). Furthermore, previous studies have indicated that these effects may be exacerbated by co-ingesting other substances (Edvardsen et al. 2017). For example, using opioids and alcohol in combination leads to greater difficulty concentrating and other adverse side effects when compared to opioid use alone (Gudin et al. 2013).

The lack of data on prescription opioid-impaired drivers is an important omission given recent national data on drugged driving prevalence and traffic accident mortality. Estimates from the NSDUH indicate 10.1 million Americans drove under the influence of a drug other than alcohol in the past year (Lipari et al. 2016). The most recent National Roadside Survey indicated that opioids were one of the most prevalent drugs detected among drivers with 5.5% of daytime drivers and 4.7% of nighttime drivers testing positive. Opioids were second only to marijuana and other cannabinoids (Kelley-Baker et al. 2017). The increase in drug-impaired driving is associated with increased fatalities. In fact, the percentage of fatally injured drivers who test positive for drugs now surpasses the percentage testing positive for alcohol (Hedlund 2017). Although impossible to attribute prescription opioids as the cause of the crash, an analysis of fatally injured drivers showed that the prevalence of detected prescription opioids increased seven-fold from 1995 to 2015 (Chihuri and Li 2017).

Given the high rates of prescription opioid misuse found in rural Appalachia and the effects that prescription opioids can have on driving-related skills, particularly when misused or used in combination with other substances, the lack of information on prescription opioid-impaired drivers in this region is conspicuous. In fact, we were unable to identify any studies that have focused specifically on prescription opioid-impaired drivers in rural Appalachia. As a result, it remains unclear how this group may be different from other impaired drivers and whether new approaches for prevention and intervention are needed. The current study examines a sample of DUI offenders from rural Appalachian Kentucky to addresses two research questions: 1) What are the characteristics of prescription opioid-impaired drivers in rural Appalachian Kentucky? and 2) How are prescription opioid-impaired drivers similar to and different from other substance-impaired drivers in rural Appalachian Kentucky?

Methods

Participants

A purposive sample of 118 individuals convicted of driving under the influence (DUI) was recruited from one of three rural Appalachian counties in Kentucky. Study eligibility included (a) being at least 18 years old; (b) convicted of a DUI within the past 12 months in one of the three targeted counties; and (c) residing in the same county in which they were convicted of DUI.

Procedure

Two participant recruitment methods were used. The majority (90%) of participants were recruited from district court houses. Potential study participants were identified from court dockets, and trained interviewers attended their scheduled court proceeding. If an individual was convicted of DUI, the interviewer immediately approached them outside the courtroom, extending an invitation to participate in the study. If the DUI offender was interested in participating and met eligibility criteria, the interviewer either facilitated the interview the same day or scheduled a later appointment. Approximately 27% of approached, eligible offenders refused to participate. Primary reasons for refusal included not having time or being accompanied by family/friends. The remaining participants (10%) were recruited through flyers placed in various locations around the community. Interested individuals contacted interviewers and were assessed for eligibility. Participants’ DUI conviction information was also verified through court records. For those eligible, interviews were scheduled with the participant at their earliest convenience.

After participants provided their informed consent, they completed a one-time confidential research interview. Participants received $25 for their participation, and their responses were protected by a federal Certificate of Confidentiality. All study procedures were approved by the University of Kentucky Institutional Review Board.

Measures

Demographic information included age, sex, race/ethnicity, marital status, education level, and whether they had a valid driver’s license at the time of arrest.

Past year substance use was collected using sections of the Addiction Severity Index (McLellan et al. 1992). Participants were asked to report on their past year use of alcohol, marijuana, powder and crack cocaine, methamphetamine, heroin, amphetamines, sedatives/tranquilizers/barbiturates, and prescription opioids. Only illicit, nonmedical use was recorded for prescription medications.

Past year mental health information was also collected using the Addiction Severity Index. Participants self-reported whether they had experienced more than two weeks of depression, anxiety, or trouble remember or concentrating in the past year.

Participants were asked to report their past criminal activity, including DUI and non-DUI offenses. They reported their age at the time they first drove impaired, were first arrested for DUI, and were first convicted of DUI. Participants also reported the total number of times they had been arrested and convicted of DUI and estimated the number of times they have driven impaired in the past year and in their lifetime. Finally, participants reported separately whether their most recent DUI involved alcohol and whether it involved drugs. If drugs were involved, participants indicated the specific drug(s).

For other criminal activity, participants reported whether they had ever committed (regardless of arrest) drug crimes (drug possession or trafficking), property crimes (shoplifting, burglary, motor vehicle theft, forgery or fraud, other theft/larceny, trafficking stolen goods, arson, or vandalism), and violent crimes (assault, rape/sexual assault, or robbery). Participants also reported the age they first committed a non-DUI crime and the total number of lifetime arrests for non-DUI offenses.

Analytic Plan

Upon examination of participants’ estimates of past year and lifetime frequency of impaired driving episodes, a few of the estimates provided by participants seemed implausibly high. As a result, any value of 1000 or above for past year estimates (n=2) and 10,000 or more for lifetime estimates (n=4) was removed. After the removal of these cases for the analysis of these specific variables, the distribution of estimates remained positively skewed. To better approximate a normal distribution, the natural logarithm of each estimate was calculated. These logarithmically transformed estimates were then used in the subsequent ANCOVA analyses for past year and lifetime impaired driving episodes.

Participants were then separated into three groups based on the substances they reported were involved in their most recent DUI conviction: those who reported being under the influence of prescription opioids (including those who were impaired by other substances), those who reported being under the influence of drugs (but not prescription opioids), and those who reported being under the influence of alcohol but not any drugs. Five participants could not be categorized either because they denied having alcohol or drugs in their system at the time of DUI arrest (n=4) or had missing data (n=1). Additionally, seven participants were removed from the sample because they reported that their current DUI involved prescription opioids but denied illicit use (n=7). This left data from 106 participants available for analysis.

Prescription opioid-impaired drivers (n=33) were compared to other drug-impaired drivers (n=29) and alcohol only-impaired drivers (n=44) using a series of ANCOVA and logistic regression analyses controlling for sex differences across groups. Analyses examined differences in demographic information, past year substance use and mental health characteristics, and criminal history, including DUI. Analyses were conducted using SPSS 24 (IBM Corp. 2016).

Results

Demographics

The sample was predominately male (69.8%), White (96.2%), with an average age of 35.0 years (SD = 10.1) and 11.8 years of education (SD = 1.8). Almost one-third of participants were married (31.4%), and they reported an average annual income of $18,756 (SD = $21,697). Participants had a high prevalence of past year substance use; more than three-quarters reported using alcohol (82.1%) and drugs (76.4%) in the past year while nearly half (47.6%)reported past year prescription opioid misuse. The majority had been arrested for a drug-involved DUI offense (58.5%). Participants reported driving under the influence for the first time at 19.4 years old (SD = 6.5) with their first DUI arrest occurring at 27.1 years old (SD = 10.4). Participants reported an average of 3.1 DUI arrests (SD = 3.0) with an average of 2.6 DUI convictions (SD = 2.2).

The sociodemographic characteristics were similar between prescription opioid-impaired drivers and other substance-impaired drivers, with the only significant difference between groups being sex. Specifically, alcohol only-impaired drivers were significantly more likely to be male than prescription opioid-impaired drivers (OR = 3.44, 95% CI 1.18 – 9.99, p = .023), while female impaired drivers were overrepresented in the prescription opioid-impaired and other drug-impaired groups.

Substance Use and Mental Health

Participants’ past year substance use and mental health histories varied across groups (see Table 2). Compared to prescription opioid-impaired drivers, alcohol only-impaired drivers were significantly less likely to have used sedatives (AOR = 0.26, CI 0.10 – 0.70, p = .007) or any illicit drugs (AOR = 0.08, CI 0.02 – 0.38, p = .002) in the past year. However, alcohol only-impaired drivers were more likely to have used alcohol in the past year (AOR = 5.92, CI 1.14 – 30.77), p = .035). Participants who were alcohol only-impaired (AOR = 0.04, CI 0.01 – 0.14, p < .001) and those impaired by other drugs (AOR = 0.07, CI 0.02– 0.27, p < .001) were both less likely to report having misused prescription opioids in the past year.

Table 2.

Past Year Substance Use & Mental Health by DUI Type (N=106)

Prescription Opioid-Impaired
(n=33)
Other Drug-Impaired
(n=29)
Alcohol Only-Impaired
(n=44)
Substance Use
    Alcohol 75.8% 69.0% 95.5%*
    Marijuana 48.5% 51.7% 40.9%
    Cocaine 9.1% 13.8% 9.1%
    Crack 12.1% 10.3% 0.0%
    Sedatives 66.7% 72.4% 31.8%**
    Amphetamine 15.2% 10.3% 2.3%
    Methamphetamine 9.1% 0.0% 2.3%
    Heroin 3.0% 0.0% 0.0%
    Prescription Opioids 87.9% 35.7%*** 25.0%***
    Any Illicit Drug Use 93.9% 89.7% 54.5%***
Mental Health
    Depression 59.4% 42.9% 45.5%
    Anxiety 74.2% 50.0% 56.8%
    Trouble Remembering 34.4% 39.3% 29.5%
    Any Mental Health Problem 84.4% 57.1%* 59.1%*

Note. Significance levels are in comparison to the prescription opioid-impaired group

*

p ≤ .05

**

p ≤ .01

***

p ≤ .001.

Alcohol only-impaired drivers (AOR = 0.04, CI 0.01– 0.14, p < .001) and those who were impaired by other drugs (AOR = 0.07, CI 0.02– 0.27, p < .001) were significantly less likely to report experiencing mental health problems in the past year compared to prescription opioid-impaired drivers.

DUI and Other Criminal Activity

An analysis of DUI and other criminal activity revealed additional differences between prescription opioid-impaired drivers and other substance-impaired drivers. Alcohol only-impaired drivers reported significantly fewer past year (F(2,98)=6.28, p = .003, η2 = .11) and lifetime (F(2,98)=4.59, p = .012, η2 = .09) impaired driving episodes compared to prescription opioid-impaired drivers (Table 3). Other criminal history was then compared across the three impaired driver groups. The majority of participants self-reported that they had committed a non-DUI crime in their lifetime, although little variability was observed across groups. The exception was for alcohol only-impaired drivers who were significantly less likely to have committed a property crime in the past (AOR = 0.27, CI 0.10– 0.73, p = .01).

Table 3.

DUI and Other Criminal Activity by DUI Type (N=106)

Prescription Opioid-Impaired
(n=33)
Other Drug-Impaired
(n=29)
Alcohol Only-Impaired
(n=44)
DUI History
Age first drove impaired 19.8 19.4 19.1
Age first DUI arrest 24.3 28.8 28.1
Age first DUI conviction 25.0 28.9 29.2
Number of DUI arrests 3.1 2.3 3.5
Number of DUI convictions 2.6 1.8 3.0
Past Year Impaired Driving Episodes^
    Mean (SD) 169.4 (236.4) 74.3 (148.5) 1 59.6* (120.1)
    Median 61 12 1.5
Lifetime Impaired Driving Episodes^
    Mean (SD) 1772.3 (2385.8) 941.6(1381.5)2 1049.4** (1953.5) 3
    Median 592 268.5 81

Other Criminal History
Drug Crimes (%) 100.0% 92.9% 84.1%
Property Crimes (%) 65.6% 67.9% 34.1%**
Violent Crimes (%) 40.6% 39.3% 27.3%
Any non-DUI crime (%) 100.0% 96.4% 88.6%
Age first committed a crime 14.0 15.2 15.6
Number of lifetime arrests (non-DUI) 5.0 3.5 2.0
Ever incarcerated after conviction (%) 54.5% 58.6% 40.9%

Note. Significance levels are in comparison to the prescription opioid-impaired group

*

p ≤ .05

**

p ≤ .01

***

p ≤ .001

^

Raw means are presented in the table, but ANCOVA analyses were conducted using logarithmic transformed means.

1

n=27

2

n=26

3

n=43

Discussion

The present study examined characteristics of prescription opioid-impaired drivers in rural Appalachian Kentucky and explored similarities to and differences from other substance-impaired drivers from this region. While prescription opioid-impaired drivers were similar to other rural Appalachian substance-impaired drivers on many characteristics, particularly when compared to other drug-impaired drivers, several notable differences between groups did emerge.

Substance Use

Prescription opioid-impaired and other rural Appalachian substance-impaired drivers use a wide variety of substances, a finding consistent with prior research (Staton-Tindall et al. 2014; Webster et al. 2009). Alcohol and illicit marijuana, sedative, and prescription opioid use were most prevalent with significantly higher prescription opioid use among those with a prescription opioid-involved DUI. Although alcohol only-impaired drivers had significantly lower rates of illicit drug use, more than half of this group reported past year illicit drug use, which is consistent with earlier research highlighting the co-occurrence of alcohol and drug use disorders among DUI offenders (Palmer et al. 2007).

Mental Health

High rates of past year mental health problems were also found, most notably for depression and anxiety. This has been shown in other samples of DUI offenders, particularly in repeat DUI offenders (Nelson et al. 2015; Freeman, Maxwell, and Davey 2011), as well as in samples of rural Appalachian offenders (Staton et al. 2015). Other studies have shown that individuals with mental health problems are more likely to report prescription opioid use and abuse (Edlund et al. 2007; Sullivan et al. 2006), with some citing the well-known association between mental health problems and physical pain as the cause for such variation (Scott et al. 2009).

DUI and Other Criminal Activity

The analysis of criminal history yielded few group differences but did suggest that past year criminal activity of substance-impaired drivers from rural Appalachian Kentucky was not limited to their DUI conviction. Rather, the majority of participants reported a non-DUI crime in the past year, and approximately half of the prescription opioid- and other drug-impaired drivers reported a history of incarceration. This finding is consistent with other research showing a range of criminal activity among DUI offenders, especially those with multiple DUI convictions (Webster et al. 2009; LaBrie et al. 2007).

Frequency of impaired driving episodes was another criminal activity difference between impaired driver groups. Prescription opioid-impaired drivers reported more frequent past year and lifetime impaired driving episodes when compared to alcohol only-impaired drivers. One possible explanation for this finding is the lower overall substance use reported by alcohol only-impaired drivers in the sample. Although alcohol only-impaired drivers reported less frequent impaired driving, it is noteworthy that more than half of the sample reported more than 100 lifetime impaired driving episodes and more than half of those participants reported more than 1000 episodes. This finding that most impaired driving episodes do not result in arrest is consistent with the discrepancy found between national estimates of alcohol-impaired driving episode (121 million, Jewett et al. 2015) compared to the annual number of DUI arrests (1.3 million, Federal Bureau of Investigation 2012).

Prescription Opioid-impaired Driving

Finally, it is important to highlight the overall proportion of prescription opioid-impaired drivers in the present study. Nearly one-third of the sample reported being prescription opioid-impaired at the time of DUI arrest. This finding documents prescription opioid-impaired driving as a consequence of the prescription opioid epidemic in rural Appalachia. These rates are significantly higher than other studies that have assessed same day use of prescription opioids in DUI offenders (8.4%; Pilkinton, Robertson, and McCluskey 2013) and in fatally injured drivers (7.2%; Chihuri and Li 2017). The elevated rates of prescription opioid misuse in rural Appalachia (Zhang et al. 2008; SAMHSA 2017), in general, may explain the higher prevalence of prescription opioid-impaired drivers in this sample compared to other substance-impaired driving populations. Opioid prescription rates are significantly higher in Appalachian Kentucky than in other areas of the state (Luu et al. 2018). This greater availability of prescription opioids has led to their diversion and misuse (Keyes et al. 2014).

Implications

The prevalence of illicit drug use in this sample highlights the need for thorough clinical assessment for drug use disorders in addition to the alcohol use disorders typically associated with DUI offenders (Maxwell 2012; Webster et al. 2010), especially given recent evidence from a national sample of nighttime drivers which found that positive, alcohol breath tests were associated with certain drug use disorders and that a significant proportion of drivers had polysubstance use disorders (Scherer et al. 2017). Failing to identify the scope and magnitude of an individual’s substance use problems can limit the effectiveness of treatment. Comprehensive substance abuse assessment and treatment of DUI offenders is crucial in areas like rural Appalachia where substance abuse services are limited. Criminal justice involvement may provide the only opportunity to receive substance abuse services (Staton-Tindall et al. 2015; Leukefeld et al. 2005).

Study findings also point to the importance of identifying and treating mental health problems among rural Appalachian DUI offenders.. The increased prevalence of co-occurring mental health and substance use disorders among criminal justice populations are well documented (Peters et al. 2015); however, these mental health problems are often inadequately addressed, particularly for those under community supervision (Lurigio and Swartz 2000). Just as in the case with substance abuse disorders, failure to detect a co-occurring mental health disorder can lead to an increased risk of re-offending and other poor treatment outcomes (Peters et al. 2008).

Study findings also have implications for impaired driving prevention. The majority of substance-impaired drivers from rural Appalachian Kentucky reported that their DUI arrest was drug-involved. This finding is indicative of the changing landscape with respect to impaired driving in the US (Hedlund 2017; Lipari et al. 2017). As a result, existing prevention programs and education programs for DUI offenders that stress the “Don’t Drink and Drive” message may need to also emphasize the dangers associated with drug-impaired driving, including driving under the influence of medications like prescription opioids (Pilkinton et al. 2013). This is particularly important in light of findings that youth perceive drug-impaired driving, particularly marijuana-impaired driving, as less dangerous than alcohol-impaired driving (McCarthy, Lynch, and Pederson 2007).

Finally, these findings present challenges for the criminal justice system in rural Appalachia. Drug-impaired driving detection by law enforcement is hampered by the absence of uniform roadside drug testing, necessitating that suspected drug-impaired drivers be taken to a facility (e.g., hospital) to obtain a biological specimen for drug testing. Other cues officers use to detect drunk drivers (e.g., the smell of alcohol) may not be effective to detect drug-impaired drivers, such as prescription opioid-impaired drivers. Conviction of drugged driving is further complicated by drivers who hold a valid prescription for a drug and are arrested after taking a therapeutic dose (DuPont 2010). The policies surrounding drugged driving and legal prescription drug use are a clear avenue for continued research (Voas et al. 2013). In addition, future studies should examine undetected drug use among alcohol-impaired drivers, including the effects of opioids and other drugs used in combination with alcohol.

Limitations

Consideration of study limitations is important when interpreting the present findings. First, the purposive sample described in this study was recruited from three rural Appalachian counties in Kentucky, which may limit generalizability to other areas of rural Appalachia. Although certain demographic characteristics of the sample were consistent with the Central Appalachian region, generalizability may also be affected by the fact that the sample was largely comprised of White males. Second, the study sample is relatively small and may be unable to detect smaller, but potentially important, differences between groups. Third, combinations of opioids or other drugs and alcohol were not accounted for in creating the three groups of impaired drivers, despite recent research indicating opioids and other narcotics as the most prevalent drug class found in multiple drug-using drivers (Lacey et al. 2016). Future research should consider examining impaired drivers who use only one substance prior to driving compared to those under the influence of multiple substances, using toxicology reports as biological verification. Fourth, no information on drug dose or level of drug-impairment was obtained, making assessments of actual traffic safety risk difficult. Participants, however, were specifically asked to report driving episodes when they were under the influence of drugs. Finally, data are self-reported. Response validity could have been impacted given participants’ recent legal trouble relating to their substance use and courthouse recruitment; however, previous research has shown that self-report data from drug users and criminal offenders can be reliable and valid (Solbergdottir et al. 2004; Thornberry and Krohn 2000).

Conclusion

The present study provides important new information about an unexamined and dangerous consequence of the prescription opioid epidemic in rural Appalachia. Almost one-third of the sample indicated that illicit prescription opioid use was involved in their DUI offense. Prescription opioid-impaired drivers were found to use a variety of drugs and have high rates of mental health problems and other non-DUI criminal activity. Furthermore, prescription opioid-impaired drivers reported frequent impaired driving, representing a potential threat to public safety in their communities. Although not conclusive, findings suggest that prescription-opioid drivers in rural Appalachian Kentucky could possess a more complicated set of problems and behaviors than the typical alcohol-impaired driver. As a result, future research should continue to examine prescription opioid-impaired drivers, not just in rural Appalachian Kentucky but in other settings as well, to gain a better understanding of their possible unique characteristics. These studies are essential to inform the development of effective tailored interventions, especially in areas like rural Appalachia, which have limited resources to address drug-impaired driving.

Table 1.

Demographic Information by DUI Type (N=106)

Prescription Opioid-Impaired
(n=33)
Other Drug-Impaired
(n=29)
Alcohol Only-Impaired
(n=44)
Age 33.2 32.3 38.1
% Male 60.6% 58.6% 84.1%*
% White 97.0% 96.6% 95.5%
% Never Married/Single 15.2% 31.0% 29.5%
Education (years) 12.2 11.9 11.6
% Valid License 78.8% 62.1% 72.7%

Note. Significance levels are in comparison to the prescription opioid-impaired group

*

p ≤ .05

**

p ≤ .01

***

p ≤ .001.

Acknowledgements

This study was supported by Grant R03AA015964 from the National Institute on Alcohol Abuse and Alcoholism; J. Matthew Webster, Principal Investigator; and by the staff and resources of the Center on Drug and Alcohol Research at the University of Kentucky. Opinions expressed are those of the authors and do not represent the position of the National Institute on Alcohol Abuse and Alcoholism.

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