We will conduct a two-arm individually randomized controlled trial in six Government-run secondary schools in New Delhi. The targeted sample is 240 adolescents in grades 9-12 with persistent, elevated mental health difficulties and associated impact. Participants will receive either a brief problem-solving intervention delivered by lay counsellors (intervention), or enhanced usual care comprised of problem-solving booklets (control). Self-reported adolescent mental health difficulties and idiographic problems will be assessed at 6 weeks (co-primary outcomes) and again at 12 weeks post-randomization. In addition, adolescent-reported impact of mental health difficulties, perceived stress, mental wellbeing and clinical remission, as well as parent-reported adolescent mental health difficulties and impact scores, will be assessed at 6 and 12 weeks post-randomization. Parallel process evaluation, including estimations of the costs of delivering the interventions, will be conducted.

Background and rationale:

This study is part of a larger research program called PRIDE (PRemIum for aDolEscents) for which the goals are to:

• develop a trans-diagnostic, stepped-care intervention targeting common mental disorders in school-going adolescents in India; and
• evaluate its effectiveness in reducing symptom severity and improving recovery rates among adolescent participants

The components of the stepped-care intervention will be evaluated in separate, linked studies. The main aim of the current trial is to evaluate the effectiveness of a low-intensity problem-solving intervention (the first step of the PRIDE stepped-care intervention) delivered by school counsellors for adolescents with common mental health problems, when compared with enhanced usual care (EUC).

The primary hypothesis is that the intervention will be superior to the EUC control condition in reducing the severity of self-reported mental health symptoms and prioritized problems at six weeks post-randomization.

Study design and setting:

This is a parallel-arm, individually randomized controlled trial with equal allocation of participants between arms. The trial will be conducted in six Government-run secondary schools (Grade 9 to 12; approximately corresponding to 13-20 years of age) from the National Capital Territory of Delhi, India. A process evaluation will be nested in the trial to provide findings that will assist in the interpretation of the trial results and to inform potential implementation of the PRIDE intervention on a wider scale.

Eligibility criteria: see 'Eligibility' section.

Interventions: see 'Arms and Interventions' section.

Screening measures: Referred adolescents will be screened for common mental health difficulties, impact and chronicity using the SDQ (Goodman et al., 2000), according to the eligibility criteria set out below.

Sociodemographic information: This will be obtained from all enrolled participants through an interviewer-administered questionnaire, with responses entered directly into a tablet computer.

Outcome measures: see 'Outcome Measures' section.

Economic measures: The costs associated with the introduction of the experimental and control arm interventions will be estimated by adding the personnel costs for counsellors and supervisors, together with fixed costs of training (venue/per diem), furniture and supplies. All costs will be reported in Indian Rupees and then converted to US Dollars at the average daily exchange rate over the preceding 12 months.

Process measures:

Process data on enrollment, randomization and assessment procedures will be obtained from researcher-completed record forms. These will be collated to obtain assent/consent rates of adolescents and parents (and reasons for missing assent/consent); randomization rates (and reasons for randomization errors); completion rates of baseline and follow-up outcome assessments (and reasons for non-completion); and time lags between intended and completed assessments (and reasons for deviating from targets). In addition, motivations for help-seeking and expectancies for the school counselling program will be explored at the time of eligibility assessment through a brief qualitative interview with a sub-sample of referred students.

Intervention processes will be assessed using additional data sources. Counsellor-completed session record forms will be used to obtain process data on duration, spacing and frequency of attended sessions (and reasons for non-attendance); and intervention uptake and completion rates (and reasons for pre-intervention and mid-intervention drop-out). Participants' adherence to treatment and potential engagement challenges will be assessed using checklists within the same record forms, indicating whether or not the student completed practice exercises at home, used the POD (Problems-Options-Do it yourself) booklets at home, brought the POD booklets to the session, and demonstrated understanding of POD booklets and session content. Use of POD booklets will be assessed in each arm of the trial at 6- and 12-week follow-up assessments using a brief adolescent-reported measure that asks about estimated frequency of home use and perceived helpfulness of POD booklets in the preceding 6 weeks. Service satisfaction data will also be obtained from participants in each trial arm at 12 weeks using the 8-item Client Satisfaction Questionnaire (CSQ-8) (Larsen et al., 1979). Supplementary questions will elicit open-ended written feedback on the most helpful aspects of the available intervention and suggested modifications.

Intervention fidelity will be assessed using independent ratings of audio-recorded sessions: 10% of all recordings will be selected at random and rated by a psychologist who is not directly involved with supervision of the intervention providers.

Sample size:

Sample size estimations have been produced for two co-primary outcomes: mental health symptoms (SDQ Total Difficulties score) and idiographic problems (YTP score). A Bonferroni correction has been used to adjust for multiple primary outcomes. Following pilot work that indicated large (uncontrolled) effect sizes, the investigators have conservatively assumed that the intervention will be associated with an effect size of 0.5 (difference in means/SD) on both the primary outcomes with 90% power at 6 weeks post-randomization. The investigators have also assumed a loss to follow up of 15% over 6 weeks, based on pilot work. Based on these assumptions and a 1:1 allocation ratio for individual randomization, a total of 240 participants will be required. This sample size provides 80% power to detect an ES of 0.44.

Recruitment methods and sampling frame:

A combination of whole-school and classroom-based sensitization methods will be used to generate referrals into the trial. This will include posters, teacher briefings and classroom-based information sessions for students. Referrals may be initiated in a number of ways: (1) adolescents can directly approach a researcher following a classroom information session; (2) adolescents can provide their contact details in a 'drop box' placed in the school; or (3) adolescents can request a referral through a teacher (or a teacher may raise the prospect of referral directly with a student before initiating the same). Referred participants will be assessed for eligibility using the SDQ; those meeting eligibility criteria will be invited to participate in the trial. Referred adolescents who do not meet eligibility criteria will receive a handout on self-care strategies.

In the academic year 2018-19, there are 172 class divisions of grades 9-12 in the six collaborating schools in New Delhi, and approximately 50 students per class. Seventy classes will participate in an embedded recruitment trial (see separate protocol: NCT03633916). The host intervention trial will recruit participants originating from the 70 classes sampled in the embedded recruitment trial, as well as participants drawn from other classes as needed. The precise schedule of recruitment activities in the remaining 102 classes will be calibrated according to referral patterns and caseload capacity for intervention providers in the various schools.

Assent/consent procedures:

Referred adolescents will be invited to meet with a researcher when a 2-stage consent process will be initiated.

1. Assent/consent for using screening data: All referred students who are screened for eligibility will be provided with written information and structured verbal information about the potential use of their screening data for evaluation of help-seeking patterns. Assent, consent will be obtained on signed consent forms.
2. Assent/consent for trial participation: Eligible students will be provided with additional structured verbal information and a printed participant information sheet about trial participation. Assent will be sought for adolescents who are below 18 years of age, and consent will be sought for adolescents who are 18 years of age or older. For assenting participants aged below 18 years of age, consent from a parent/guardian will be sought by a researcher. This will involve two levels of consent: consent for their child to participate in the trial, and consent for a parent's/guardian's own participation in the study. The informed assent/consent procedure with adolescents will be completed during school hours, while the parent/guardian consent process will be completed at the family's home or another convenient location. Details of assenting/consenting adolescents and consenting parents (and those declining to participate) will be logged on an ongoing basis, along with reasons for non-participation.

Data collection procedures (see 'Outcome Measures' for detailed descriptions of measures referenced below):

Field researchers will administer outcome measures in schools, at home or other convenient locations. The adolescent-reported SDQ will be collected by a field researcher on a digital tablet device, and will also serve as the basis for eligibility screening. Other baseline assessments will be completed as soon as possible after assent/consent procedures are completed (and ideally on the same day). The YTP will be administered on paper while the remaining scales will be administered on a digital tablet device. The YTP will be administered on paper as it asks the participants to describe, prioritize and score their three main problems; the same list of problems will be rated again during follow-up assessments (see below). Adolescents will also be assessed on the PSS-4 and SWEMWBS. Index parents will be invited to complete the SDQ only. Sociodemographic data from the adolescent and parent/guardian will also be collected on digital tablets.

Follow-up assessments will be completed at 6 and 12 weeks post-randomization. The 6-week outcome is the primary end-point, as the optimal effect of the intervention is expected to occur immediately after the intervention has been completed. The 12-week end-point is included to evaluate the durability of intervention effects. The CSQ-8 (a process measure of service satisfaction) will be collected at 12 weeks post-randomization only. Additionally, all adolescents will complete a self-report measure on the use of the intervention materials (problem-solving booklets) provided in the intervention and control arms.

Data analysis plan:

Descriptive analyses: Initial analyses will compare baseline characteristics of referred adolescents who did and did were not enrolled into the trial for various reasons. Baseline characteristics of enrolled participants will be compared between trial arms. Findings will be reported as per the CONSORT guidelines, using intention-to-treat analysis, including a trial flow chart.

Outcome measures will be summarized at recruitment, at 6- and 12-week follow up by trial arm, and overall. These will be summarized by means (standard deviation), medians (interquartile range), or numbers and proportions as appropriate. For continuous outcomes, histograms will also be plotted within each arm to assess how closely the scales follow a normal distribution. This will determine how the outcomes are described as well as the choice of inferential analysis method.

Outcome analyses: The primary analyses will be on an intention-to-treat basis at the 6-week end-point, adjusted for baseline values of the outcome measure; school (as a fixed effect in the analysis) to allow for within-school clustering, counsellor variation (as a random effect); and variables for which randomization did not achieve reasonable balance between the arms at baseline, or those associated with missing outcome data. Intervention effects will be presented as adjusted mean differences and effect sizes (ES), defined as standardized mean differences.

For continuous variables, the analysis of secondary and exploratory outcomes will use similar methods to the primary outcome analysis for continuous variables. For the binary outcome (remission), the intervention effect will be reported as the adjusted odds ratio with 95% CIs. Generalized (linear or logistic) random-effects regression models will be used, adjusting for baseline outcome score and clustering, and other baseline variables as above. For outcomes to be examined over the 12-week follow-up period (other than remission), regression models will include a variable to represent 'time' in order to indicate whether the data were collected at the 6- or 12-week end-point. To assess whether the intervention effect varies over time, an intervention x time interaction term will be fitted to allow for a different intervention effect at 6 vs 12 months, although this will not be highly powered.

We will explore potential moderators of intervention effects, with respect to a priori defined modifiers (i.e. chronicity of mental health difficulties, severity of mental health difficulties, YTP type, SDQ caseness profile). We will fit relevant interaction terms and test for heterogeneity of intervention effects in regression models. A mediation analysis will be conducted to examine whether the theoretically-driven a priori factor (perceived stress at 6 weeks) mediates the effects of the intervention on primary outcomes (i.e. mental health symptoms and idiographic problems) at 12 weeks. Additionally, intervention effects for students who receive fewer sessions than prescribed will be estimated using the Complier Average Causal Effect structural equation model.

Process evaluation: We will undertake descriptive statistical analysis of quantitative process data in order to explore the implementation of intervention procedures. In addition, thematic analysis will be used to code and organise qualitative interview data on intervention expectancies (assessed prior to enrolment) and qualitative written feedback on service satisfaction (assessed at 12-week follow-up). Findings from the various data sources will be triangulated and used to develop explanatory hypotheses about potential differences in intervention delivery and engagement across schools, subgroups of participants and providers. Process evaluation findings will be used to facilitate interpretation of the main trial results. The trial statisticians may conduct further analyses to test hypotheses generated from integration of the process evaluation and trial outcome data.

Cost-effectiveness analysis: The costs associated with the introduction of the PRIDE and control arm interventions will be estimated by adding the fixed costs of materials and personnel costs.

Eligibility criteria:

For adolescent participants:

• Enrolled as a student in Grades 9-12 (corresponding to 13-20 years of age)
• Experiencing elevated mental health symptoms, based on response in the borderline or abnormal range (scores of 19 or higher for boys and 20 or higher for girls) on the self-reported SDQ Total Difficulties scale
• Experiencing significant distress and/or functional impairment, based on response in the abnormal range (scores of 2 or higher) on the self-reported SDQ Impact Supplement
• Experiencing difficulties for >1 month, based on response to the self-reported Chronicity item from the SDQ Impact Supplement
• For adolescents under 18 years of age, able to provide informed assent to participate and supported by parental consent
• For adolescents over 18 years of age, able to provide informed consent to participate

For parent participants:

• A primary parental caregiver or guardian for the index adolescent
• Able to provide informed consent to participate, and if adolescent age 18+ years, parental involvement is supported by the index adolescent
• Proficient in spoken English or Hindi

Exclusion criteria:

For adolescent participants:

• Requiring urgent medical attention (defined as needing emergency treatment or in-patient admission)
• Unable to communicate clearly (due to a speech or hearing disability or inability to comprehend one of the program's languages)
• Already receiving intervention for mental health problems
• Received PRIDE intervention in past six months during pilot study
• Not providing assent
• Adolescent whose parents are not providing consent

For parent participants:

• Unable to communicate clearly (due to a speech or hearing disability or inability to comprehend one of the program's languages)
• Intoxicated at the point of consent or assessment

Anonymised Individual Participant Data along with data dictionaries will be shared with other researchers after 12 months of completion of the trial. Data pertaining to the interventions received and outcomes at primary and secondary end point will be shared upon reasonable requests made to the PI and in accordance with the guidelines of sponsors, collaborators and funder of the study.

12 months after completion of trial.

Access to data will be granted to researchers after review of requests by PI and in accordance with the guidelines of sponsors, collaborators and funder of the study.

The randomization list will be generated by an independent statistician. The randomization code will be concealed using sequentially numbered opaque sealed envelopes to maximize allocation concealment.

Baseline assessments will be carried out by field researchers prior to randomization. The six- and 12-week outcome assessments will be carried out by a team of field researchers who will be blind to allocation status.