Table 3.

Studies not included in the cumulative effect size estimates

Study	Country	Participant details						Intervention details
		N	Age (years ± sd)	Pubertal stage (Tanner)	Weight status	% males	Sex of training group	Location	Weeks × per week (min per session)	Sets/reps/intensity	Exercises	Assessment tool	Outcomes	Quality score
Faigenbaum et al. [31]	USA	EG 24, CG 9	EG 10.8 ± 0.4, CG 10 ± 0.4	1–2	Healthy	46	Mixed	Community	8 weeks × 2 (60 min)	2–3 sets, 6–8 reps, 6 RM	Leg extension, chest press, leg curl, overhead press, bicep curl	The Martinek Zaichkowsky Self-concept Scale for Children [41] Adapted Self-efficacy Scale [42]	Self-concept, self-efficacy upper body, self-efficacy lower body	3
Holloway et al. [30]	USA	EG 13, CG 18	EG 16, CG 16	/	Healthy	0	Females	School—free time	12 weeks × 3 (60 min)	3 sets, 3–10 reps, 65–80% 1 RM	Free weight Olympic-style parallel back squat, bench press, behind-the-neck standing shoulder press, bent-over rows, abdominal crunches	The Physical Self-efficacy Scale [43]	Total self-efficacy, weight training efficacy, physical task efficacy, perceived physical ability, physical self-presentation, physical self-efficacy	2
Mullane et al. [32]	USA	EG 20	EG 10.5 ± 0.5	1	Mixed	90	Mixed	Community	8 weeks × 2 (45 min)	Circuit 60–90s, 6 exercises	Leg press, assisted pull ups, shoulder press, bicep curls, pushups, sit ups	Adapted Children’s Self-efficacy Scale [44]	Self-efficacy of exercise	2

“/” indicates no data available

EG experimental group, CG control group, sd standard deviation, rep repetition, max maximum, RM repetition maximum