The level of unmet intervention need among adolescents with risky alcohol and other drug (AOD) use is a persistent public health problem. Recent data from the 2023 Monitoring the Future national survey indicate that, among 12th graders, 46% reported using alcohol (more than just a few sips); 39% marijuana; 39% nicotine via vaping; and 43% illicit drugs, including inhalants [1]. According to the 2023 National Survey on Drug Use and Health (NSDUH), among adolescents aged 12 to 17 years in 2022, 8.7% (or 2,228,000 adolescents) reported a substance use disorder in the past year [2]. Troublingly, the rates of treatment enrollment among this high-need age group are considerably low, with only 4.6% of the adolescents who meet the criteria for substance use disorders receiving specialty care [2]. When left unaddressed or ineffectively treated, AOD use during adolescence often continues into adulthood, precipitating long-term substance use and mental health disorders and being associated with a cascade of other health consequences, as well as imparting enormous economic costs to society [3].

Preventing youth AOD use and intervening early with those who use are key to reducing the many consequences of risky use. As shown in neurodevelopment research on risky behavior in youth, adolescence is the critical period both for starting AOD use and experiencing harmful consequences as a result [4]. Adolescence is a developmental stage characterized by risk behaviors, including AOD experimentation; adolescents are also vulnerable to negative impacts of addictive substances, which can further impair judgment, interfere with brain development, and increase addiction risk [5]. Moreover, AOD use is associated with the 3 leading causes of death among teenagers: motor vehicle crashes, homicides, and suicides [6]. Prevention and early intervention can also prevent progression to more severe AOD use that carries the risk of overdose and death.

Given that the majority of teenagers in the United States visit primary care (PC) clinics at least once per year [7], PC settings provide rich opportunities to detect and intervene with adolescents at risk for AOD problems. The most recent guidelines issued by the American Academy of Pediatrics prescribe universal AOD screening for teenagers during both routine preventive appointments and nonpreventive PC visits [8]. Recognizing the unique role that PC providers can play in meeting the challenge of adolescent AOD use, the American Academy of Pediatrics further recommends that providers learn procedures for screening, brief intervention, and referral to treatment (SBIRT) and how to integrate SBIRT into medical care for adolescents [9]. SBIRT for adolescents (SBIRT-A) entails a set of clinical procedures for detecting youth at risk of AOD problems and delivering appropriate prevention or early intervention, including universal screening for AOD risk level and formulaic guidelines for providing brief motivational interventions and appropriate treatment referral to patients identified as at risk [8,10]. Notably, when delivered using standard procedures, SBIRT-A amounts to an adolescent-focused approach in which most or all activities involve only the given youth [11,12].

SBIRT-A is widely recommended to promote detection and early intervention for AOD use in PC [9,13]. In practice, although 50% to 86% of pediatricians report screening for AOD use, the use of standardized screening assessments and systematic brief interventions (BIs) is low [14]. In research trials, approximately 25% to 35% of adolescents screen positive for substance use when systematic screening is implemented [15,16]. Research reviews and meta-analyses show that BI procedures can be effective in reducing adolescent drinking [17,18] and, when delivered in PC settings, have demonstrable impacts and cost-effectiveness for quality-of-life indicators [18-20]. Recent studies, including 2 multisite effectiveness trials that collectively examined thousands of adolescent visits in PC clinics [15,21], further suggest that SBIRT-A is scalable in PC [16,22].

Despite these promising developments, there remain significant limitations in SBIRT-A research and practice in PC. Prior controlled SBIRT-A studies conducted in PC have yielded inconsistent findings with regard to implementation feasibility [23], in large part due to significant practice barriers to delivering SBIRT-A in pediatric care. PC providers are generally reluctant to implement SBIRT-A, citing insufficient time, limited training in substance use, unfamiliarity with the procedures, a lack of readiness to address a positive AOD screen result, limited resources for referrals to specialty care, and concerns about confidentiality [24-28]. Moreover, despite data from systematic reviews supporting BIs in PC [18], the US Preventive Services Task Force recently determined that evidence is insufficient to assess the balance of benefits versus harms of screening adolescents for unhealthy AOD use due to variability in study methods and quality [29]; consequently, it withheld a recommendation for widespread SBIRT-A delivery in pediatric settings [10,30]. Given existing gaps in the SBIRT-A research base on the effectiveness of SBI and the effect of involving caregivers in SBI procedures as well as the impact of BIs on outcomes beyond AOD use and the corresponding uncertainties in the policy and practice status of SBIRT-A in pediatric settings, there is urgent need to advance the scope of SBIRT-A effectiveness studies in PC [28].

Tablet-guided SBIRT-A approaches have the potential to reduce documented implementation barriers through offering a standardized road map for addressing AOD use. Tablet-guided SBIRT-A procedures eliminate the need for the memorization of complicated adjunctive SBIRT-A procedures. Instead, tablet-guided SBIRT-A approaches provide a new and systematic way to address positive AOD screening that is more efficient than the existing eclectic practices that providers currently rely on. Providers are guided through step-by-step interventions designed with their time constraints in mind, leveraging automated tools and well-vetted workflow integration [16,31,32]. Procedures include recommendations for providers on addressing positive AOD screens with youth and their caregivers without jeopardizing youth autonomy or violating confidentiality.

This randomized effectiveness trial will advance research on SBIRT-A in PC by conducting a head-to-head test of 2 conceptually grounded, evidence-informed approaches: a standard adolescent-only approach (SBIRT-A-Standard) versus a more expansive family-based approach (SBIRT-A-Family). The SBIRT-A-Family approach enhances the procedures of the SBIRT-A-Standard approach by screening for AOD risk with both adolescents and caregivers; leveraging multidomain, multireporter AOD risk and protection data to inform case identification and risk categorization; and directly involving caregivers in BI and RT activities [43]. The trial will test the effectiveness of SBIRT-A-Standard versus SBIRT-A-Family for preventing the escalation of AOD use (aim 1); reducing AOD use risk factors and consequences, decreasing co-occurring behavior problems, enhancing parent-adolescent communication about AOD use, and increasing quality-of-life indicators (aim 2); linking youth and families to behavior counseling services (aim 3); and investigating the extent to which the effects of SBIRT-A-Family vary based on youth characteristics (age, sex, and race or ethnicity) and youth AOD risk status (aim 4).

This trial uses a 2-arm parallel-group multisite randomized effectiveness design. The 2 SBIRT-A approaches (SBIRT-A-Standard and SBIRT-A-Family) both use digitally supported BIs [16,49] that are a substantial upgrade over routine practice and consistent with the recommendations of the American Academy of Pediatrics to leverage digital tools. Individual youth and their caregivers are randomized as a family unit to the study condition. Adolescent and family outcomes for 2300 youth (n=2000, 86.96% identified as at risk of AOD use and n=300, 13.04% as a developmental comparison identified as low risk) are assessed over 1-year follow-up.

The protocol was developed according to the SPIRIT (Standard Protocol Items: Recommendations for Interventional Trials) 2013 statement (Multimedia Appendix 1).

Study recruitment and randomization as well as all SBIRT-A activities occur on the day of the visit in PC offices. Figure 1 depicts the flow of patient recruitment, patient randomization, and SBIRT-A delivery for various risk categories. Recruitment efforts will be multimethod, consisting of (1) informational flyers in wait areas, (2) outreach to families by site research staff, and (3) warm handoff by site administrators and providers when needed. Interested caregivers are prompted to contact on-site research staff, who then give the designated caregiver a tablet to (1) complete an electronic research consent form, (2) provide family demographic and brief assessment information, and (3) complete a screening tool assessing their concerns about the adolescent’s AOD use and related behavior problems as well as family communication about AOD issues. Simultaneously, research staff give a tablet to the youth, who completes an electronic research assent form, and if their caregiver gives consent, an AOD screening tool and brief assessment information.

For families in which both caregiver and youth give informed consent and assent and complete screening, the tablet automatically (1) randomizes the family to study condition, using urn randomization to achieve balanced allocation of participants based on sex, race, ethnicity, and age group; and (2) computes a risk category. In SBIRT-A-Standard, the risk category (low risk, riding risk only, distant use, or recent use) is assigned using youth screening data only, while SBIRT-A-Family uses youth plus caregiver screening data to assign the risk category (low risk, hidden substance use risk, named mental health risk, or named substance use risk). For youth and families assigned to the low risk category (ie, no positive screen result), youth are invited to view tablet-delivered psychoeducation slides, and caregivers are invited to view a video tour and enrollment link to web-based educational and support resources for adolescent AOD. For youth and families assigned to an at risk category, youth and caregivers each view tablet-delivered psychoeducation videos and (for some risk categories) complete provider-facing BI and RT activities that are differentiated based on condition assignment and tailored to the respective risk categories. Multimedia Appendix 2 summarizes study activities for each condition; full descriptions are provided in the Study Conditions subsection. All study providers are trained to deliver both SBIRT-A approaches (ie, provider crossover design).

Every adolescent or family assigned to an at risk category in either condition is enrolled until study capacity is reached (n=2000). In addition, a randomly selected subsample of adolescents (n=300; balanced across conditions) screened as low risk are followed for outcome assessments; the selection of the group categorized as low risk uses quota sampling based on sex, race, ethnicity, and age. Outcome data are collected via remote digital assessment methods at initial assessment (as soon as possible after the PC visit) and at 3, 6, 9, and 12 months after the PC visit using REDCap Cloud software (Research Electronic Data Capture developed at Vanderbilt University and licensed to cloud-based technology company nPhase, Inc), a widely used secure, Health Insurance Portability and Accountability Act (HIPAA)–compliant, web-based data collection platform. Figure 2 shows the SPIRIT (Standard Protocol Items: Recommendations for Interventional Trials) checklist depicting the schedule of trial enrollment, interventions, and assessments. All youth and caregivers separately receive both email and SMS text prompts when assessments are due, using contact information provided during the consenting process. When either youth or caregiver fails to complete a follow-up assessment, research staff members blinded to condition assignment reach out to arrange a live assessment via telephone or videoconference. Each assessment requires approximately 20 minutes to complete.

Clinicians and families enrolled in the study retain the right to withdraw consent at any time. The protocol will be discontinued at any site where procedures become burdensome or otherwise impinge on the routine performance of participating staff. Analysis of intervention impacts and potential harm will be continuous throughout the trial. In cooperation with the administration of the partnering sites, investigators will provide full study debriefing and offer counseling referrals to any participant aggrieved or injured due to trial participation.

Both study conditions follow a similar set of procedures anchored in the use of handheld tablets. As depicted in Figure 1, tablets are used to collect screening data from youth and caregivers, calculate youth and family risk levels, and offer digitally supported BI and RT activities to users. Point-of-care digital SBIRT procedures can improve patient outcomes by facilitating more rapid and standardized services, data-informed clinical decision-making, and improved practice efficiency [16,51]. Both conditions feature 2 types of digital BIs: patient facing (ie, self-administered: patients navigate the BI alone on the tablet) and provider facing (ie, provider administered: providers and patients jointly navigate the BI on the tablet). The total time needed to deliver each approach matches the typical wait time for preventive visits plus time devoted to delivering comparable SBIRT-A procedures for youth identified as at risk in routine PC. Both conditions allow all youth and caregivers to speak with providers about AOD issues at any point they choose, in keeping with best practices honored at partner sites. When study interventions are not delivered during the main visit, providers can opt to complete interventions in a follow-up visit scheduled within 1 week or complete immediate handoff to an on-site behavioral health specialist (trained in all study procedures) to complete the intervention [21,52]. In addition, caregivers in both conditions are digitally prompted to enroll in a web-based suite of caregiver-focused resources (helpline, parent coaching, parent groups and electronic resources, and SMS text messaging) specifically designed to support youth AOD risk reduction and caregiver self-care [53].

Site PC clinic staff who provide SBIRT-A to clinic patients are trained by experts in all intervention procedures for both conditions. We expect to train 10 providers per clinic. Providers attend a 1-hour site orientation followed by 3 hours of live training. First, providers complete a 1-hour introduction to motivational interviewing for adolescents, caregivers, and families. Next, providers attend two 1-hour live training sessions to apply motivational interviewing principles to support adolescent, caregiver, and family behavior change. The self-study training will include video-recorded presentations on motivational interviewing principles. Live training will include a review of counseling steps for each intervention, video-recorded counseling demonstrations, and opportunities to practice counseling steps. These training procedures have been successfully implemented in similar PC SBIRT studies [16,31]. Baseline fidelity is established via a 1-hour individual counseling practice with research staff. Thereafter, providers attend a monthly 1-hour clinical consultation meeting held by authors MB and NPP to maintain and enhance intervention skills, review notable clinical encounters, and troubleshoot procedural and technology challenges. In addition, providers will complete practice interventions using standardized case vignettes on a 6-month cadence. Vignette scenarios will be informed by implementation experiences shared by providers during the course of the consultation period; these serve as training refreshers and will also provide fidelity feedback data to be incorporated in consultation meetings, as will data summarized from the provider self-report fidelity checklist described in the next subsection [73].

A provider self-report fidelity checklist is collected after every encounter with every family. The checklist assesses information on which the provider-facing intervention components were delivered: adolescent BNI, caregiver BNI, facilitated conversation, or RT. Checklist items feature 3-point Likert-type rating scales to indicate how clinically helpful the given component was for the encounter: not at all, somewhat, or very. The checklist also logs (1) which implementation scenario was selected for intervention delivery: pediatrician intervention during visit, pediatrician follow-up visit, or behavioral specialist intervention on the visit day; (2) whether the intervention occurred in person or via video call; and (3) the number of minutes spent delivering the intervention or interventions. Research indicates that clinicians can reliably self-report on the delivery of behavioral interventions with families using brief postencounter fidelity checklists [74-76]. In addition, during initial follow-up assessment, adolescents and caregivers report on which components they experienced during the encounter: psychoeducation, BNI, facilitated conversation, or RT.

CRAFFT [54,55] is a widely used and well-validated youth report tool that measures patient use of alcohol, cannabis, nicotine, illegal drugs, prescription medication, or anything else to get high in the past year and the past 3 months. It also asks about riding in a car driven by someone (including self) who was intoxicated (described in the SBIRT-A-Standard Procedures subsection). If AOD use is reported, the tool asks 5 additional questions: “Do you ever use alcohol or drugs to relax, feel better about yourself, or fit in?” “Do you ever use alcohol or drugs while you are by yourself [alone]?” “Do you ever forget things you did while using alcohol or drugs?” “Do your family or friends ever tell you that you should cut down on your drinking or drug use?” “Have you ever got into trouble while you were using alcohol or drugs?” The Hooked on Nicotine Checklist [56] is a 10-item youth report of nicotine dependence completed by patients who report any days of using a vaping device containing nicotine, or any tobacco products, during the past 30 days. Parent-Adolescent AOD Communication Frequency [77] is a 6-item youth and caregiver report of how often parents and teens talk to one another about key AOD issues (eg, the health risks of use and discipline regarding use) scored on a 5-point scale ranging from never to very often [78-80]. Parent-Adolescent AOD Communication Quality [81] is a 6-item youth and caregiver report of the quality of communication between parent and teen about AOD issues (eg, “My caregiver/teen and I are interested in each other’s opinions about AOD” and “If my caregiver/teen and I talk about drugs, I feel understood”) scored on a 5-point scale ranging from not at all to very much [41,77]. Beliefs and Worries about Youth AOD Use is an 8-item measure that asks caregivers what they believe about their teen’s use of AOD in the past year and in the past 3 months (response options: “I am sure or pretty sure my teen has not used,” “I suspect but I am not sure my teen has used,” and “I am sure or pretty sure my teen has used”). Follow-up questions ask which substances they believe their teen has or may have used and their worries about the impact of their teen’s use of AOD across contexts (ie, home, school, peers, and safety). This measure was created for this study, inspired by the Screening to Brief Intervention tool [8] and the CRAFFT tool [55] and vetted by SBIRT experts. The Brief Problem Monitor is a 19-item caregiver report component of the well-validated Achenbach youth behavior problem assessment system [67] that yields normed scores with clinical cut levels for 4 problem domains: internalizing (anxiety, depression, and somatic complaints), externalizing (aggression and conduct problems), inattention or impulsivity, and total problems [82].

The timeline followback (TLFB) method [83] is the gold standard method for collecting youth report retrospective estimates of AOD use using a calendar visual aid to facilitate recall. This study used a computer-administered and calendar-assisted instrument created for REDCap-compatible remote asynchronous follow-up assessment modeled after the TLFB [31]. This version assesses the number of days that youth used alcohol, tobacco, marijuana, non–medical prescription drugs, inhalants or vapes, and herbs or synthetic drugs over the past 90 days. If alcohol was used, follow-up questions assess binge drinking episodes. The KIDSCREEN-27 questionnaire (youth and caregiver report) [84] measures youth functioning in social and school domains. Items assess the degree to which youth have experienced problems with a specific task or activity during the past month. It is internationally used and has excellent psychometric properties with strong construct validity and test-retest reliability [84,85]. The Services Assessment for Children and Adolescents (caregiver report) [86] assesses the youth’s past and current use of inpatient, outpatient, and school-based behavioral health services. It has shown strong validity and test-retest reliability [87] as well as interrater reliability between parent and child reports [88]. Items were added to assess caregiver enrollment and the use of web-based educational and support resources for adolescent AOD. Perceived Risk (youth report) [89] asks youth to rate the degree to which people risk harming themselves if they use various categories of substances on a 4-point scale ranging from no risk to great risk. Peer Deviance (youth report) [89] assesses the number of peers who use various substances on a 5-point scale ranging from none to all. Parent Rules about Substance Use (youth and caregiver report) [90] assesses parent rules about using various substances on a 6-point scale ranging from not allowed to use AOD to no rules about using AOD. The Family Assessment Device (youth and caregiver report) [91] assesses family relationships, communication, and problem-solving on a 4-point scale ranging from strongly agree to strongly disagree. The Comprehensive Adolescent Severity Inventory (youth report) [92] assesses academic achievement, school connection, and disciplinary record. Youth-Provider Connectedness (youth report) [93] assesses the level of trust and connection adolescents feel toward their health care providers on a 5-point scale ranging from not at all to very much. Psychoeducation Knowledge (caregiver report; created for this study) assesses caregiver knowledge of the tablet-delivered AOD psychoeducation. The Parent-Adolescent AOD Communication Frequency measure, Parent-Adolescent AOD Communication Quality measure, and Brief Problem Monitor (all described in the previous subsection) are also administered at follow-up to youth and caregivers.

Projecting 2000 youth identified as at risk enrolled in the study and allowing for a 20% attrition rate, a final 1-year follow-up sample size of 1600 youth identified as at risk is anticipated. Statistical power to detect small intervention effects on alcohol use (aim 1) was estimated; to be conservative, multiply imputed data for attritted cases were not included in the power analyses. An a priori power analysis was conducted using a Monte Carlo simulation [102]. Specifically, 1000 simulated data sets of 1600 youth randomly assigned to condition were generated. Each youth in each simulated data set had 5 follow-up outcome measurements (initial assessment and at 3, 6, 9, and 12 months), and youth were nested in 3 sites in proportions equal to those reported by PC partner sites. The intervention effect size was simulated as an increase in the proportion of youth reporting alcohol use in the none category at each assessment. On the basis of the preliminary analyses of data from the 2023 Monitoring the Future national survey [1], it was projected that 62.3% of the youth identified as at risk would report alcohol use in the never category at initial assessment, increasing to 78.4% in the SBIRT-A-Family condition and 67.9% in the SBIRT-A-Standard condition at 1-year follow-up. These increases represent a small effect size difference compared to the NC group at 1-year follow-up for SBIRT-A-Family, a moderate effect size difference compared to the NC group at 1-year follow-up for SBIRT-A-Standard, and a small effect size difference at 1-year follow-up between the 2 at-risk categories. The simulation program assumed a correlation of 0.90 between repeated measures within individuals. In addition, on the basis of power calculations in a similar randomized trial by Sterling et al [15], an interclass correlation of 0.02 was assumed to reflect the within-site clustering effect. To estimate power to detect an intervention effect on alcohol use, the submodels in (1) and (2) were fit to all 1000 simulated data sets. In each simulated analysis, the significance of the difference in the slope parameters between the submodels (b_1,sbi−fam−b_1,sbi) was tested. Power was computed as the proportion of P values <.05 across the 1000 sets of results, which was 0.99. Thus, the trial is well powered to detect small intervention effects on alcohol use. A similar level of power to detect effects on other substances is assumed, given that these outcomes are measured using the same scale. Power on aim 2 and aim 3 outcomes is expected to be >0.95, given that these outcomes are measured on continuous scales. The study is also powered for analyses aimed at examining moderator effects for demographic subgroups [21] and risk categories (aim 4); for example, to estimate power to detect effects within youth AOD risk categories, power analyses were repeated within the subsample of simulated youth classified as recent use, projected to comprise approximately 36% of the full sample based on the preliminary analyses of data from the 2020 NSDUH [103]. A power of 0.95 to detect a small effect on the change in the proportion of youth reporting alcohol use in the never category among youth categorized as recent use was obtained. These results extend to any subsample that comprises at least 35% (560/1600) of the projected sample; subsamples of at least this size are projected for male and female participants; Black, Hispanic, and White non-Hispanic youth; and younger and older youth.

Central ethics approval for all study activities has been obtained from Solutions IRB (2023/01/3) and local ethics approval from research sites has been obtained. Caregivers and youth will independently provide informed consent or assent before the initiation of study activities (Multimedia Appendix 6). All study data will be collected on encrypted and password-protected tablets and stored on REDCap Cloud, a HIPAA-compliant data platform. All study activities will be subject to monitoring by the data safety and monitoring board of the same institution (Multimedia Appendix 7). Any modifications to the protocol that might impact the conduct of the study or its specified objectives and procedures will require a formal amendment to the protocol and approval by the institutional review board and the data safety and monitoring board before implementation. Families will receive a US $10 Amazon gift card for the completion of the screening, and each participant will receive US $170 in gift card vouchers of their choice during the follow-up period delivered via Tango Card (US $30 each for the initial assessment and 3- and 6-month follow-ups and US $40 each for the 9- and 12-month follow-ups).

SBIRT-A is widely endorsed but currently underused in pediatric PC settings, and urgent questions remain about optimal approaches and overall effectiveness [21,104]. In particular, RT procedures in PC remain virtually untested among youth [66]. In addition, whereas research strongly supports involving families in various kinds of interventions for adolescent AOD [17], SBIRT-A effectiveness trials testing approaches that actively engage family members in PC are absent. This trial is designed to help fill these research gaps. Figure 3 presents a framework that depicts key conceptual and methodological factors across intervention components for the adolescent-only SBIRT-A-Standard approach, specifies the rationale for involving caregivers in all SBIRT-A components, and identifies key additions to the SBIRT-A-Standard approach that are introduced by the innovative SBIRT-A-Family approach. This framework aligns closely with kindred conceptual models for family-based AOD prevention in general [69,71] and for family-focused AOD prevention approaches specifically designed for PC [27,105,106], as well as for family-based SBIRT-A models in PC [43,107].

Although our study is not designed to evaluate implementation feasibility, both approaches tested in this trial feature procedures designed to surmount common barriers to SBIRT-A implementation in PC settings: the use of digital resources to enhance provider knowledge and intervention delivery, the embedding of interventions into routine workflow with minor disruption, ongoing technical assistance that incorporates site-specific data performance indicators, and the like [24,25]. Thus, we will gain important information about potential implementation strategies that we will test in future implementation trials once the most effective SBIRT intervention model is identified [49]. Ultimately, the trial results will inform the critical health decision of whether and how to include caregivers in SBIRT-A activities conducted in pediatric care. Guidelines for delivering SBIRT-A procedures based on the trial results will directly inform PC clinical practice and directly benefit the general pediatric population of adolescents at risk for AOD problems and their caregivers.

Importantly, this trial also emphasizes patient-centered outcomes research methods in several ways. It is recruiting participants representative of the full spectrum of adolescents and caregivers attending PC visits. Both SBIRT-A approaches rigorously protect the privacy and confidentiality of both youth and caregivers; neither learn directly or indirectly about the confidential information collected from the other person on surveys or during provider interviews without expressed permission to share such data. All SBIRT-A procedures can be delivered by trained staff across the PC provider spectrum: nurse practitioners, physicians, physician assistants, behavioral counselors, and so forth [108]. These patient-centered design features enhance the consistency and effectiveness of SBIRT-A delivery in PC.

As all partner sites are hospital affiliated and located in major urban centers, the study results may not be fully generalizable to pediatric PC practices that operate in distinctly different geographic regions (eg, rural settings), under different health care organizational structures, or without on-site internet support. Due to study inclusion criteria, the results will not be fully generalizable to the population of youth who attend PC visits without caregivers (such youth tend to skew as older) or to youth and caregivers who are not fluent in English or Spanish. The RT procedures embedded in both study conditions are limited to the degree that a given PC site has limited or no options for referring patients to behavioral care providers who serve teenagers with AOD problems. It is beyond the scope of SBIRT-A to intervene directly in cases of multigenerational AOD use, including when the caregiver is experiencing AOD problems; pediatric clinics routinely contend with this matter. Regarding condition allocation, a primary advantage of individual-level over site-level randomization is higher statistical power [109]. The primary drawback of individual-level randomization is the potential for cross-contamination between study conditions, which could dampen intervention effect sizes and reduce statistical power [110]. Cross-contamination is not expected to be substantial in this trial, given that both conditions feature large subgroups of patients who will receive SBIRT-A content in strictly digital format (ie, no research interaction with providers).