Table 2.

Screening tool for independent author screening

	Yes	No	Comments
Language  Is the full paper in English?
	Go to next question	Exclude
Peer review  Has the paper been peer reviewed?
		Exclude
Type of study Is the study described as one of the following:
i. Clustered randomised controlled trial
ii. Non-randomised controlled trial/quasi-experimental study
iii. Pre/post-test study design
		Exclude
Participants  Are the participants’ children, adolescents or adults who are considered as an athlete, leader, coach or member within a sporting (amateur or professional) organisation?
		Exclude
Intervention type  Does the intervention contain a mental health and/or well-being training component?
		Exclude
Intervention location  Is the intervention within a sport setting (sport: ‘rule-governed, structured, competitive gross movement characterised by physical strategy, prowess and chance’ (Rejeski and Brawley [37]). Exclude if intervention is outside the domain of sport (i.e. leisure, exercise, art, music).
		Exclude
Outcomes i. Does the study report mental health AND awareness, knowledge, first aiding, fitness, intentions, action planning, self-efficacy/competence? ii. Does the study report mental health outcomes (i.e. anxiety, depression, or subjective well-being markers).
Include for follow-up