This intervention includes standard medical care followed by receipt of a computer-based sham. The sham is similar in format and duration as the computer-based Personalized Assessment Feedback but will engage youth in nutrition and exercise-related questions.

The acceptability of the Personalized Assessment Feedback (PAF) intervention will be assessed by youth post-intervention (only youth allocated to the PAF intervention). Measure assessed acceptability (satisfaction with the intervention, perceptions of the helpfulness, credibility of the personalized assessment feedback) and feasibility (time to completion, user friendliness).

The Child and Adolescent Services Assessment (CASA) is a self-report instrument designed to assess the use of community- and hospital-based health and social services. We focused each question so that we collected service use for an alcohol use problem.

As part of CASA measure (secondary outcome measure to measure health and social services utilization) adolescents were asked two additional questions on receptivity to receiving services. The data below reflects the first question: On a scale of 1-5, where 1 is it's definitely a bad idea and 5 it's definitely a good idea, do you think that if someone you knew had an alcohol use problem they should get help or seek treatment?

As part of CASA measure (secondary outcome measure to measure health and social services utilization) adolescents answered 8 additional questions on perceived barriers to services: 1) Do you have any feelings such as dislike, distrust or fear about talking with doctors, counselors or other professionals? 2) Do you have any feelings about what other people would think if you sought help? 3) Do you find there is a lack of information that affected health services sought? 4) Do you have any concerns about the amount of time it takes to get help? 5) Were the health services you sought just not readily available? 6) Did you feel you just didn't want to talk to anyone about such a sensitive problem? 7) Was there a problem with registration, setting up appointments or contacting professionals? 8) Was there a problem getting to where treatment was available?

As part of CASA measure (secondary outcome measure to measure health and social services utilization) adolescents were asked two additional questions on receptivity to receiving services. The data below reflects the second question: On a scale of 1-5, where 1 is it's definitely cannot help and 5 it definitely can help, do you think that doctors or counselors can help with alcohol use problems in general?

The Child and Adolescent Services Assessment (CASA) is a self-report instrument designed to assess the use of community- and hospital-based health and social services. We focused each question so that we collected service use for an alcohol use problem.

The Child and Adolescent Services Assessment (CASA) is a self-report instrument designed to assess the use of community- and hospital-based health and social services. We focused each question so that we collected service use for an alcohol use problem.

Standard medical care followed by a computer-based sham intervention. The sham was similar in format and duration as the Personalized Assessment Feedback but engaged youth in nutrition and exercise-related questions.

Total of all reporting groups

Race and Ethnicity were not collected from any participant.

AUDIT-C (Alcohol Use Disorders Identification Test Consumption subscale): 1 item regarding frequency of alcohol consumption, 1 item regarding the amount of alcohol consumption, and 1 item regarding the frequency of binge drinking. Scores are summed and range from 0 to 12 with higher scores reflecting more consumption. A cut-score of 3 is recommended for identifying youth with harmful and hazardous drinking.

Standard medical care followed by a computer-based sham intervention. The sham was similar in format and duration as the Personalized Assessment Feedback but engaged youth in nutrition and exercise-related questions.

To be calculated following active recruitment (18 months from study start date of patient enrolment). The recruitment rate relates to recruitment into the study, and not recruitment per arm as randomization and allocation occurred after enrolment.

The recruitment rate was calculated as the number of enrolled participants (n=44) divided by the number of eligible participants (n=117).

We were interested in the overall study retention rates at 1- and 3-months post-intervention, and not retention rates per arm, as the purpose of calculating the rates was to assess the feasibility of a follow-up period in a definitive randomized controlled trial.

Total number of participants analyzed was 44. Each allocation guess by staff/physicians/nurses was analyzed using the number of adolescents allocated to each arm: 18 to intervention; 26 to control.

The acceptability of the Personalized Assessment Feedback (PAF) intervention will be assessed by youth post-intervention (only youth allocated to the PAF intervention). Measure assessed acceptability (satisfaction with the intervention, perceptions of the helpfulness, credibility of the personalized assessment feedback) and feasibility (time to completion, user friendliness).

The Child and Adolescent Services Assessment (CASA) is a self-report instrument designed to assess the use of community- and hospital-based health and social services. We focused each question so that we collected service use for an alcohol use problem.

Due to the large amount of missing data (at 1-month [52.3%] and 3-months [59.0%] post-intervention) we did not assess change in utilization from baseline to 1- and 3-months post-intervention (pre-specified secondary outcome) as the results would be prone to bias.

As part of CASA measure (secondary outcome measure to measure health and social services utilization) adolescents were asked two additional questions on receptivity to receiving services. The data below reflects the first question: On a scale of 1-5, where 1 is it's definitely a bad idea and 5 it's definitely a good idea, do you think that if someone you knew had an alcohol use problem they should get help or seek treatment?

As part of CASA measure (secondary outcome measure to measure health and social services utilization) adolescents answered 8 additional questions on perceived barriers to services: 1) Do you have any feelings such as dislike, distrust or fear about talking with doctors, counselors or other professionals? 2) Do you have any feelings about what other people would think if you sought help? 3) Do you find there is a lack of information that affected health services sought? 4) Do you have any concerns about the amount of time it takes to get help? 5) Were the health services you sought just not readily available? 6) Did you feel you just didn't want to talk to anyone about such a sensitive problem? 7) Was there a problem with registration, setting up appointments or contacting professionals? 8) Was there a problem getting to where treatment was available?

As part of CASA measure (secondary outcome measure to measure health and social services utilization) adolescents were asked two additional questions on receptivity to receiving services. The data below reflects the second question: On a scale of 1-5, where 1 is it's definitely cannot help and 5 it definitely can help, do you think that doctors or counselors can help with alcohol use problems in general?

The Child and Adolescent Services Assessment (CASA) is a self-report instrument designed to assess the use of community- and hospital-based health and social services. We focused each question so that we collected service use for an alcohol use problem.

Due to the large amount of missing data (at 1-month [52.3%] and 3-months [59.0%] post-intervention) we did not assess change in utilization from baseline to 1- and 3-months post-intervention (pre-specified secondary outcome) as the results would be prone to bias.

The Child and Adolescent Services Assessment (CASA) is a self-report instrument designed to assess the use of community- and hospital-based health and social services. We focused each question so that we collected service use for an alcohol use problem.

Due to the large amount of missing data (at 1-month [52.3%] and 3-months [59.0%] post-intervention) we did not assess change in utilization from baseline to 1- and 3-months post-intervention (pre-specified secondary outcome) as the results would be prone to bias.

Standard medical care followed by a computer-based sham intervention. The sham was similar in format and duration as the Personalized Assessment Feedback but engaged youth in nutrition and exercise-related questions.