Alcohol Abuse, Alcohol Drinking, Alcohol; Harmful Use
Conditions
Keywords
Social Norms, Personalized Normative Feedback, Sexual Minority Women
Brief summary
Sexual minority women in the United States are more likely to drink alcohol, engage in heavy drinking, and experience alcohol-related problems than are heterosexual women. Yet, to date, no evidence-based intervention or prevention efforts have been developed to reduce alcohol consumption among female sexual minority community members. The proposed research seeks to narrow the disparity in alcohol intervention research by examining an innovative gamified personalized normative feedback (PNF) intervention to reduce drinking among sexual minority women found to frequent social media sites and overestimate norms related to peers' general alcohol use and drinking to cope with sexual minority stigma. The newly developed GANDR (Gamified Alcohol Norm Discovery and Readjustment) PNF format takes the well-established core components of a PNF alcohol intervention and delivers these components within an inviting, social media inspired, culturally-tailored online competition. This incognito intervention format is designed to be more appealing, engaging, believable, positively received, and thus effective than standard web-based PNF. The version developed for sexual minority women delivers PNF on alcohol use and stigma-coping behaviors within the context of an online game about sexual minority female stereotypes. Following two introductory rounds of play by a large cohort of sexual minority women, a sub-sample of 500 sexual minority female drinkers will be invited to participate in an evaluation study. Study participants will be randomized to receive 1 of 3 unique sequences of feedback (i.e., Alcohol & Stigma-Coping, Alcohol & Control, or Control topics only) during 2 intervention rounds taking place over a 6-month period. The randomized feedback sequences and multiple rounds of play will allow the research team to evaluate whether PNF on alcohol use reduces sexual minority women's alcohol consumption and negative consequences relative to PNF on control topics (AIM 2: H1), examine whether providing PNF on stigma-coping behaviors in addition to alcohol use further reduces alcohol use and consequences beyond alcohol PNF alone (AIM 2: H2), and identify mediators and moderators of intervention effectiveness (AIM 3).
Detailed description
This incognito alcohol intervention is culturally tailored to appeal to heavy social media using sexual minority women residing in the US and ranging in age from 21 to 55 years. Personalized normative feedback on sexual identity and age specific descriptive drinking and stigma-coping norms are delivered to players within the context of an online competition designed to challenge sexual minority women stereotypes and increase visibility. To increase the believability of the normative statistics, players create a social media-inspired profile at registration which includes an optional photo, brief bio, links to social media accounts, and other basic information. Registered players are able to browse the profiles of others and actual norms for all topics are transparently generated by the responses of players taking part in the competition. To increase motivation and engagement, each monthly round of the competition features a point-based reward system, a leader board, and a cash prize that is awarded to the top scorer who demonstrates the greatest accuracy in perceptions of peers. To decrease defensive reactions and increase appeal, feedback topics are ostensibly selected by chance in the game with treatment PNF on alcohol use and stigma-coping behaviors delivered alongside feedback on control topics of high interest to community members (e.g., style, relationships, sex, etc.). Appeal and credibility are also gained through sponsorship and promotion of the competition by several collaborating community organizations trusted as sources for health and social information by sexual minority women. One round of the game is played each month over a 8 month period. Players are encouraged to browse player profiles before each round and it is made clear that the goal is to grow one's score by submitting accurate guesses and strategic bets on the responses of other players in one's age and sexual identity group. Each round includes questions about 2 to 3 topics ostensibly selected by a slot machine like spinner. For each topic, players make guesses about the behaviors and experiences of other players in their age and sexual identity group, choose amounts of points to bet on these guesses being true of the group, and then contribute to actual group norms by answering parallel questions. Each round is open for 30 days. Once closed, players are sent a text message containing a private link at which they can see detailed results (PNF) for the round, view the leaderboard and cash prize winner, and play the next round. Packaging this intervention as a fun, identity-relevant competition for sexual minority women rather than a transparent alcohol intervention study allows feasibility and efficacy to be evaluated simultaneously, with a high degree of ecological validity. First, 1200 sexual minority women will be recruited to take part in the online competition. No participation-based incentives will be offered to players beyond the opportunity to compete for a variable cash prize each round. Then, following two initial rounds of play, a sub-sample of 500 drinkers will be invited to take part in an incentivized evaluation study after answering alcohol use questions in Round 3. Upon consenting to participate in the evaluation study, participants will be randomized to receive 1 of 3 unique sequences of feedback (i.e., Alcohol & Stigma-Coping, Alcohol & Control, or Control only) during intervention Rounds 3 and 4. Short-term reductions in alcohol use will be assessed in Round 6 of the competition where players will be prompted to guess, bet on, and answer alcohol use and control topic questions for a second time (i.e., Replay Bonus Round; 2 month follow-up). Following all rounds of the competition, a short survey will assess the alcohol use and negative consequences of Evaluation Study participants a final time (4 month follow-up). Feasibility analysis will examine engagement with the online competition platform and sustainability of play in the absence of traditional study participation incentives among players not involved in the Evaluation Study. Efficacy analysis will focus on study participants randomly assigned to 1 of the 3 feedback conditions in order to: 1) evaluate whether PNF on alcohol use reduces sexual minority women's alcohol consumption and negative consequences relative to PNF on control topics; 2) examine whether providing PNF on stigma-coping behaviors in addition to alcohol use further reduces alcohol use and consequences beyond alcohol PNF; and, 3) identify mediators and moderators of intervention effectiveness.
Interventions
Personalized Normative Feedback (PNF) is a popular social norms-based intervention strategy which presents individuals with a personalized, individual report designed to correct misperceived peer norms using a graphical display. Bar charts compare actual alcohol use statistics for the peer group to A) participants' estimates of peer drinking and, B) their own self-reported drinking.
Sponsors
Study design
Intervention model description
The web app is programmed to invite an eligible sub-sample of participants from the larger population to take part in an evaluation study during the competition's 3rd monthly round. Those who consent to participate are automatically randomized by Qualtrics Research Suite to receive 1 of 3 unique sequences of feedback (i.e., Alcohol & Stigma-Coping, Alcohol & Control, or Control topics only) during 2 intervention rounds taking place during a 6-month period.
Eligibility
Inclusion criteria
* Registered for the online competition * Accept the competition's Terms of Service & Privacy Policy * Endorses a lesbian, bisexual, or queer female sexual identity * Is between the ages of 21 and 55 years * Has consumed 3 or more drinks on at least one occasion during the previous 2 months OR consumes alcohol 3 or more days per week * Lives in North America (US or Canada) * Does not have a partner or housemate participating * Accepts invitation and consents to participate in the Evaluation Study
Exclusion criteria
* Does not register for the online competition. * Does not accept the competition's Terms of Service & Privacy Policy * Is younger than 21 years of age or older than 55 years of age. * Has NOT consumed 3 or more drinks on at least one occasion during the previous 2 months AND drinks less than 3 days per week * Lives outside of North America * Has a partner or housemate participating * Declines invitation * Does not consent to participate in the Evaluation Study
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in Number of Drinks Per Week From Baseline to the the 2 Month Follow-up | 2 months | At baseline and the 2 month follow-up, items assessing drinking days per week and average drinks per occasion were multiplied in order to compute number of drinks per week. These items come from the Frequency, Quantity, Max (FQM) measure. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 2 month measure of drinks per week was subtracted from the baseline measure of drinks per week such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period. |
| Change in Number of Drinks Per Week From Baseline to the 4 Month Follow-up | 4 months | At baseline and the 4 month follow-up, items assessing drinking days per week and average drinks per occasion were multiplied in order to compute number of drinks per week. These items come from the Frequency, Quantity, Max (FQM) measure. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 4 month measure of drinks per week was subtracted from the baseline measure of drinks per week such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period. |
| Change in Peak Drinks on One Occasion From Baseline to the 2 Months Follow-up | 2 months | At baseline and the 2 month follow-up, an item assessing the number of maximum drinks on one occasion from the Frequency, Quantity, Max (FQM) measure was used to assess peak drinks on one occasion over the past 30 days. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 2 month measure of peak drinks was subtracted from the baseline measure of peak drinks such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period. |
| Change in Peak Drinks on One Occasion From Baseline to the 4 Month Follow-up | 4 months | At baseline and the 4 month follow-up, an item assessing the number of maximum drinks on one occasion from the Frequency, Quantity, Max (FQM) measure was used to assess peak drinks on one occasion over the past 30 days. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 4 month measure of peak drinks was subtracted from the baseline measure of peak drinks such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period. |
| Change in Number of Negative Alcohol-related Consequences From Baseline to the 2 Month Follow-up | 2 months | At baseline and the 2 month follow-up, a single item assessed the number of negative alcohol-related consequences experienced out of a list of 8 common negative alcohol-related consequences. This item is adapted from Riley BB, Hughes TL, Wilsnack SC. Validating a hazardous drinking index in a sample of sexual minority women: Reliability, validity, and predictive accuracy. Substance Use and Misuse. 2017;52(1):43-51. doi: 10.1080/10826084.2016.1214150.\] To compute the outcome, the 2 month measure of negative consequences was subtracted from the baseline measure of negative consequences such that a positive value indicates a decrease in consequences during this period and a negative value indicates an increase in consequences during this period. |
| Change in Number of Negative Alcohol-related Consequences From Baseline to the 4 Month Follow-up | 4 months | At baseline and the 4 month follow-up, a single item assessed the number of negative alcohol-related consequences experienced out of a list of 8 common negative alcohol-related consequences. This item is adapted from Riley BB, Hughes TL, Wilsnack SC. Validating a hazardous drinking index in a sample of sexual minority women: Reliability, validity, and predictive accuracy. Substance Use and Misuse. 2017;52(1):43-51. doi: 10.1080/10826084.2016.1214150.\] To compute the outcome, the 4 month measure of negative consequences was subtracted from the baseline measure of negative consequences such that a positive value indicates a decrease in consequences during this period and a negative value indicates an increase in consequences during this period. |
Countries
United States
Participant flow
Recruitment details
Players learned about the broader LezParlay competition through 1 of 4 promotion strategies taking place over a 3-month period (11/15/2018 thru 2/15/2019): 1) flyers and promotional items distributed at local LBQ community events in Los Angeles; 2) targeted advertisement campaigns on HER social app, the leading LBQ dating app; 3) an advertisement in the email newsletter of Autostraddle, a popular blog for LBQ women; 4) targeted advertisement campaigns on Google, Facebook, and Instagram.
Pre-assignment details
The 3rd round of LezParlay served as both the screening instrument and baseline assessment for the clinical trial. A total of 1337 women completed the round with the first 912 screened for clinical trial eligibility before the 500 spots in the trial were filled. One enrolled participant randomized to an arm was withdrawn prior to intervention delivery after disclosing to the research team that she had lied about her age and was actually a minor. This resulted in an N of 499.
Participants by arm
| Arm | Count |
|---|---|
| Alcohol + Stigma Coping PNF Participants randomized to this condition will receive gamified personalized normative feedback on their alcohol use after answering questions about alcohol use and two control topics in Round 3. Then, in the very next Round of the competition (Round 4), these participants will receive gamified personalized normative feedback on their stigma coping behaviors after answering questions about their stigma coping behaviors and two control topics.
Personalized Normative Feedback: Personalized Normative Feedback (PNF) is a popular social norms-based intervention strategy which presents individuals with a personalized, individual report designed to correct misperceived peer norms using a graphical display. Bar charts compare actual alcohol use statistics for the peer group to A) participants' estimates of peer drinking and, B) their own self-reported drinking. | 143 |
| Alcohol + Control PNF Participants randomized to this condition will receive gamified personalized normative feedback on their alcohol use after answering questions about alcohol use and control topics in Round 3. Then, in the very next Round of the competition (Round 4), these participants will receive gamified personalized normative feedback on one control topic (Relationships) after answering questions about their stigma coping behaviors and two control topics.
Personalized Normative Feedback: Personalized Normative Feedback (PNF) is a popular social norms-based intervention strategy which presents individuals with a personalized, individual report designed to correct misperceived peer norms using a graphical display. Bar charts compare actual alcohol use statistics for the peer group to A) participants' estimates of peer drinking and, B) their own self-reported drinking. | 179 |
| Control PNF Participants randomized to the control arm will answer questions about the same topics as participants in the other conditions in Round 3 (Alcohol Use & Control) and Round 4 (Stigma-Coping & Control). However, in both Rounds 3 and 4 they will receive gamified PNF on control topics.
Personalized Normative Feedback: Personalized Normative Feedback (PNF) is a popular social norms-based intervention strategy which presents individuals with a personalized, individual report designed to correct misperceived peer norms using a graphical display. Bar charts compare actual alcohol use statistics for the peer group to A) participants' estimates of peer drinking and, B) their own self-reported drinking. | 177 |
| Total | 499 |
Withdrawals & dropouts
| Period | Reason | FG000 | FG001 | FG002 |
|---|---|---|---|---|
| Baseline to 2 Months Post-intervention | Lost to Follow-up | 30 | 33 | 36 |
| Baseline to 2 Months Post-intervention | Withdrawn by research team | 1 | 0 | 0 |
| Baseline to 4 Months Post-intervention | Lost to Follow-up | 42 | 50 | 51 |
| Baseline to 4 Months Post-intervention | Withdrawn by research team | 1 | 0 | 0 |
Baseline characteristics
| Characteristic | Total | Control PNF | Alcohol + Control PNF | Alcohol + Stigma Coping PNF |
|---|---|---|---|---|
| Age, Continuous | 29.87 years STANDARD_DEVIATION 7.32 | 29.47 years STANDARD_DEVIATION 7.03 | 30.37 years STANDARD_DEVIATION 7.75 | 29.73 years STANDARD_DEVIATION 7.15 |
| Ethnicity (NIH/OMB) Hispanic or Latino | 123 Participants | 40 Participants | 46 Participants | 37 Participants |
| Ethnicity (NIH/OMB) Not Hispanic or Latino | 376 Participants | 137 Participants | 133 Participants | 106 Participants |
| Ethnicity (NIH/OMB) Unknown or Not Reported | 0 Participants | 0 Participants | 0 Participants | 0 Participants |
| Interpersonal Sexual Minority Stigma Exposure | .61 units on a scale (range 0 low to 2 high) STANDARD_DEVIATION 0.69 | .66 units on a scale (range 0 low to 2 high) STANDARD_DEVIATION 0.69 | .56 units on a scale (range 0 low to 2 high) STANDARD_DEVIATION 0.66 | .62 units on a scale (range 0 low to 2 high) STANDARD_DEVIATION 0.7 |
| Race (NIH/OMB) American Indian or Alaska Native | 13 Participants | 4 Participants | 5 Participants | 4 Participants |
| Race (NIH/OMB) Asian | 39 Participants | 17 Participants | 16 Participants | 6 Participants |
| Race (NIH/OMB) Black or African American | 70 Participants | 26 Participants | 25 Participants | 19 Participants |
| Race (NIH/OMB) More than one race | 107 Participants | 31 Participants | 41 Participants | 35 Participants |
| Race (NIH/OMB) Native Hawaiian or Other Pacific Islander | 2 Participants | 0 Participants | 1 Participants | 1 Participants |
| Race (NIH/OMB) Unknown or Not Reported | 0 Participants | 0 Participants | 0 Participants | 0 Participants |
| Race (NIH/OMB) White | 268 Participants | 99 Participants | 91 Participants | 78 Participants |
| Region of Enrollment United States | 499 participants | 177 participants | 179 participants | 143 participants |
| Sex: Female, Male Female | 499 Participants | 177 Participants | 179 Participants | 143 Participants |
| Sex: Female, Male Male | 0 Participants | 0 Participants | 0 Participants | 0 Participants |
| Sexual Identity Bisexual | 116 Participants | 48 Participants | 39 Participants | 29 Participants |
| Sexual Identity Lesbian | 291 Participants | 94 Participants | 108 Participants | 89 Participants |
| Sexual Identity Queer | 92 Participants | 35 Participants | 32 Participants | 25 Participants |
Adverse events
| Event type | EG000 affected / at risk | EG001 affected / at risk | EG002 affected / at risk |
|---|---|---|---|
| deaths Total, all-cause mortality | 0 / 143 | 0 / 179 | 0 / 177 |
| other Total, other adverse events | 0 / 143 | 0 / 179 | 0 / 177 |
| serious Total, serious adverse events | 0 / 143 | 0 / 179 | 0 / 177 |
Outcome results
Change in Number of Drinks Per Week From Baseline to the 4 Month Follow-up
At baseline and the 4 month follow-up, items assessing drinking days per week and average drinks per occasion were multiplied in order to compute number of drinks per week. These items come from the Frequency, Quantity, Max (FQM) measure. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 4 month measure of drinks per week was subtracted from the baseline measure of drinks per week such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period.
Time frame: 4 months
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Alcohol + Stigma Coping PNF | Change in Number of Drinks Per Week From Baseline to the 4 Month Follow-up | 2.52 alcoholic drinks per week | Standard Deviation 4.68 |
| Alcohol + Control PNF | Change in Number of Drinks Per Week From Baseline to the 4 Month Follow-up | 1.99 alcoholic drinks per week | Standard Deviation 4.57 |
| Control PNF | Change in Number of Drinks Per Week From Baseline to the 4 Month Follow-up | 0.52 alcoholic drinks per week | Standard Deviation 5.88 |
Change in Number of Drinks Per Week From Baseline to the the 2 Month Follow-up
At baseline and the 2 month follow-up, items assessing drinking days per week and average drinks per occasion were multiplied in order to compute number of drinks per week. These items come from the Frequency, Quantity, Max (FQM) measure. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 2 month measure of drinks per week was subtracted from the baseline measure of drinks per week such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period.
Time frame: 2 months
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Alcohol + Stigma Coping PNF | Change in Number of Drinks Per Week From Baseline to the the 2 Month Follow-up | 2.75 alcoholic drinks per week | Standard Deviation 4.3 |
| Alcohol + Control PNF | Change in Number of Drinks Per Week From Baseline to the the 2 Month Follow-up | 1.99 alcoholic drinks per week | Standard Deviation 4.57 |
| Control PNF | Change in Number of Drinks Per Week From Baseline to the the 2 Month Follow-up | -.68 alcoholic drinks per week | Standard Deviation 5.49 |
Change in Number of Negative Alcohol-related Consequences From Baseline to the 2 Month Follow-up
At baseline and the 2 month follow-up, a single item assessed the number of negative alcohol-related consequences experienced out of a list of 8 common negative alcohol-related consequences. This item is adapted from Riley BB, Hughes TL, Wilsnack SC. Validating a hazardous drinking index in a sample of sexual minority women: Reliability, validity, and predictive accuracy. Substance Use and Misuse. 2017;52(1):43-51. doi: 10.1080/10826084.2016.1214150.\] To compute the outcome, the 2 month measure of negative consequences was subtracted from the baseline measure of negative consequences such that a positive value indicates a decrease in consequences during this period and a negative value indicates an increase in consequences during this period.
Time frame: 2 months
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Alcohol + Stigma Coping PNF | Change in Number of Negative Alcohol-related Consequences From Baseline to the 2 Month Follow-up | .23 negative consequences | Standard Deviation 1.82 |
| Alcohol + Control PNF | Change in Number of Negative Alcohol-related Consequences From Baseline to the 2 Month Follow-up | .25 negative consequences | Standard Deviation 1.56 |
| Control PNF | Change in Number of Negative Alcohol-related Consequences From Baseline to the 2 Month Follow-up | -.76 negative consequences | Standard Deviation 1.68 |
Change in Number of Negative Alcohol-related Consequences From Baseline to the 4 Month Follow-up
At baseline and the 4 month follow-up, a single item assessed the number of negative alcohol-related consequences experienced out of a list of 8 common negative alcohol-related consequences. This item is adapted from Riley BB, Hughes TL, Wilsnack SC. Validating a hazardous drinking index in a sample of sexual minority women: Reliability, validity, and predictive accuracy. Substance Use and Misuse. 2017;52(1):43-51. doi: 10.1080/10826084.2016.1214150.\] To compute the outcome, the 4 month measure of negative consequences was subtracted from the baseline measure of negative consequences such that a positive value indicates a decrease in consequences during this period and a negative value indicates an increase in consequences during this period.
Time frame: 4 months
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Alcohol + Stigma Coping PNF | Change in Number of Negative Alcohol-related Consequences From Baseline to the 4 Month Follow-up | .34 negative consequences | Standard Deviation 1.55 |
| Alcohol + Control PNF | Change in Number of Negative Alcohol-related Consequences From Baseline to the 4 Month Follow-up | .21 negative consequences | Standard Deviation 1.56 |
| Control PNF | Change in Number of Negative Alcohol-related Consequences From Baseline to the 4 Month Follow-up | -.67 negative consequences | Standard Deviation 1.59 |
Change in Peak Drinks on One Occasion From Baseline to the 2 Months Follow-up
At baseline and the 2 month follow-up, an item assessing the number of maximum drinks on one occasion from the Frequency, Quantity, Max (FQM) measure was used to assess peak drinks on one occasion over the past 30 days. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 2 month measure of peak drinks was subtracted from the baseline measure of peak drinks such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period.
Time frame: 2 months
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Alcohol + Stigma Coping PNF | Change in Peak Drinks on One Occasion From Baseline to the 2 Months Follow-up | 1.49 alcoholic drinks | Standard Deviation 1.78 |
| Alcohol + Control PNF | Change in Peak Drinks on One Occasion From Baseline to the 2 Months Follow-up | 1.42 alcoholic drinks | Standard Deviation 1.86 |
| Control PNF | Change in Peak Drinks on One Occasion From Baseline to the 2 Months Follow-up | -.18 alcoholic drinks | Standard Deviation 1.92 |
Change in Peak Drinks on One Occasion From Baseline to the 4 Month Follow-up
At baseline and the 4 month follow-up, an item assessing the number of maximum drinks on one occasion from the Frequency, Quantity, Max (FQM) measure was used to assess peak drinks on one occasion over the past 30 days. \[Baer J, S. Etiology and secondary prevention of alcohol problems with young adults. Baer J S, Marlatt G A, McMahon R, J, editors. Newbury Park: Sage; 1993.\] To compute the outcome, the 4 month measure of peak drinks was subtracted from the baseline measure of peak drinks such that a positive value indicates a decrease in consumption during this period and a negative value indicates an increase in consumption during this period.
Time frame: 4 months
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Alcohol + Stigma Coping PNF | Change in Peak Drinks on One Occasion From Baseline to the 4 Month Follow-up | .82 alcoholic drinks | Standard Deviation 1.71 |
| Alcohol + Control PNF | Change in Peak Drinks on One Occasion From Baseline to the 4 Month Follow-up | .61 alcoholic drinks | Standard Deviation 1.46 |
| Control PNF | Change in Peak Drinks on One Occasion From Baseline to the 4 Month Follow-up | .08 alcoholic drinks | Standard Deviation 2.06 |