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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 |
