Table 3. Risk of bias summary.

Risk of bias summary	Adequate sequence generation	Allocation concealment	Blinding (Subjective outcomes)	Incomplete outcome data addressed	Free of selective outcome reporting	Free of other sources of bias	Free of cluster recruitment bias	Free of baseline imbalance bias
Lubans and Sylva (2006)	unclear	unclear	high	low	high	high	N/A	N/A
Hill et al. (2007)	low	low	high	low	low	high	low	low
Schofield et al. (2005)	unclear	unclear	high	high	low	high	N/A	N/A
Lee et al. (2012)	unclear	unclear	high	low	low	unclear	low	low
Gomes de Barros et al. (2009)	unclear	unclear	high	low	unclear	high	low	low
Slootmaker et al. (2010)	low	low	unclear	low	low	unclear	N/A	N/A
Mauriello et al. (2010)	unclear	high	high	low	low	high	high	high
Neumark-Sztainer et al. (2010)	unclear	unclear	high	unclear	low	high	unclear	low
Singhal et al. (2010)	unclear	unclear	high	low	low	high	high	high
Bayne-Smith et al. (2004)	unclear	high	high	unclear	unclear	high	high	high