Protocol for a cluster randomized study to compare the effectiveness of a self-report distress tool and a mental health referral service to usual case management on program completion among vulnerable youth enrolled in a vocational training program.

Objectives: 1) To compare the effect of the self-report distress tool (DT) and rapid mental health referral process (MH) on vocational training program attendance. 2) To compare the effect of the DT and MH on vocational training program completion. 3) To compare the effect of the DT an MH on post-vocational training program employment.

Design: Pragmatic, multi-centre, 2x2 factorial, cluster randomized, superiority study with 4 parallel groups and primary endpoints of vocational program attendance and completion at 12 weeks and post-program employment at 24 months. Cluster randomization of each training cohort will be performed with a 1:1:1:1 allocation ratio using a site stratified, permuted-block group schema. Final sample size is expected to be 400 participants (100 per group).

Participants: Students enrolled in Community Builder's Trades & Diversity Training Program in either the city of Barrie or Sudbury (in Ontario, Canada) will be eligible for enrollment if they have an active Ontario Health Insurance Plan number and Canadian Social Insurance Number and provide written informed consent prior to Training program commencement.

Outcomes: The primary outcome includes: 1) Difference in proportion of absence-free program days from date of randomization, where absence-free days are defined as being present in class or work setting for ≥ 8 hours from Monday to Thursday during the 12-week program duration.

Trial Registration: ClinicalTrials.gov NCT05626374 (November 23, 2022).