Fig. 2 Summary of all body composition, strength and psychological meta-analyses BMI body mass index, CI confidence interval, IV inverse variance, n number of study/ data set groups included in each meta-analysis, NRCT non- randomised controlled trial Phys physical health, Psych psychosocial health, RCT randomised controlled trial, OL quality of life, SC self-concept, SMD standardised mean difference, UCT uncontrolled trial. Significant heterogeneity shown for that outcome variable