Table 2.

Overview of analyses for the feasibility study objectives

Objective	Outcomes	Measures	Analysis
1. Acceptability, engagement and demand for the OTL intervention	Acceptability	- Participant acceptability, satisfaction, intent to use services/tools, evaluation of OTL (T1 and T2 post-show), and preference for future OTL intervention - School staff member acceptability, ease of use, and importance and need for OTL intervention	- Descriptive statistics - Frequencies
	Engagement	- Participant use of support services and/or tools (T2)	- Descriptive statistics - Frequencies
2. Feasibility of implementing the intervention	Recruitment (setting-level)	- % schools contacted, interested, and participated	- Descriptive statistics - Frequencies
	Reach (individual-level)	- % potentially eligible, excluded, and participated	- Descriptive statistics -Frequencies
	Retention (setting- and individual-level)	- No. of enrolled schools returned to follow-up - No. of enrolled participants that completed follow-up	- Descriptive statistics - Frequencies
	Differential attrition	- Comparison of (a) responders, partial- and non-responders, and (b) matched and non-matched participants	- Descriptive statistics - Frequencies - Chi-Square
3. Feasibility of study methods	Data collection	- Proportion of participant responses (responders) and incomplete responses (partial and non-responders) for baseline, post-intervention and follow-up survey measures - Data collected as intended at key timepoints (pre-, during, post-show)	- Descriptive statistics - Frequencies
	Longitudinal tracking	-% of participants matched at baseline and follow-up	-Descriptive statistics - Frequencies
4. Need for mental health intervention & feasibility of outcome measures	- Mental Health outcome pre-intervention - Differences observed in mental health outcome measures (between T1 and T2)	- Anxietya, Depressiona, Life satisfactiona, Well-beingb, Perceived stressc, Locus of controld, Sleep, Screen time	- Descriptive statistics - Median (IQR) - Wilcoxon Signed-Rank

OTL On the Level

^a 1-item measure

^b The World Health Organization Five Well-Being Index (WHO-5)

^c The Perceived Stress Scale (PSS-4)

^d Internal Locus of Control scale (LOC-3)