Table 1.

Data collection methods and participant details

Participant group	Data collection method	Recruitment procedure	N	Details
Peer-supporters	Focus groups (mean duration = 44 mins, range = 38 to 48 mins)	Random selection	28 (7 per intervention school)	Female 12–13 years
	Post-training questionnaire (two- day and top-up)	Completed by all peer-supporters in attendance	52
Non-peer-supporters	Focus groups (mean duration = 37 mins, range = 21 to 49 mins)	Random selection of two participants from MVPA tertiles	24 (6 per intervention school)	Female 12–13 years
Peer-supporter trainers	Interview post two-day training (mean duration = 54 mins, range = 44 to 59 mins) and top-up training (mean duration = 40 mins, range = 32 to 49 mins)	All trainers recruited	5 (Post two-day training) 4 (Post top-up training)	Mean Age = 33.80 (SD = 9.68) years Gender: 100% female Education ranged from A Levelsa to Higher Degree
	Post-training questionnaire (two-day and top-up)	All trainers recruited	5
School contact	Interview mean duration = 28 mins, range = 14 to 43 mins	All school contacts interviewed	6	Five PE teachers One student support staff. Gender: N = 5, 83% female
Parents of peer-supporters	Interview mean duration = 25 mins, range = 20 to 34 mins	Random selection of three parents of peer-supporters per intervention school	12	Gender: N = 11, 92% female

^aA-levels are a post-16 subject-based college or sixth form leaving qualification offered by educational bodies in the United Kingdom