Study	Sequence generation	Concealment	Equivalence (outcome)	Equivalence (Characteristics)	Incomplete data	Blinding	Contamination	Selective outcome reporting
Allen et al. 1997	HR	UR	HR	HR	LR	HR	HR	LR
Arter, 2005	UR	UR	UR	HR	UR	UR	HR	LR
Barnes et al. 2003	HR	UR	HR	LR	HR	UR	LR	LR
Berlanga, 2004	UR	UR	HR	HR	UR	HR	HR	LR
Bradshaw et al. 2012	LR	LR	LR	LR	LR	UR	LR	LR
Bragdon, 2010	UR	UR	HR	HR	UR	UR	HR	LR
Brett, 1993	UR	LR	UR	HR	HR	UR	HR	LR
Burcham, 2002	LR	LR	LR	UR	HR	UR	HR	LR
Cook et al. 2014	LR	LR	LR	LR	LR	UR	HR	LR
Collier, 2002	UR	UR	LR	LR	LR	HR	HR	LR
Cornell et al. 2012	UR	UR	LR	LR	LR	UR	LR	HR
Crowder, 2001	UR	HR	UR	UR	LR	UR	HR	LR
Dynarski et al. 2003	UR	LR	LR	LR	UR	UR	HR	LR
Edmunds et al. 2012	HR	UR	UR	LR	UR	UR	HR	LR
Farrell et al. 2001	LR	UR	HR	LR	LR	LR	HR	LR
Feindler et al. 1984	UR	UR	LR	HR	LR	LR	HR	LR
Harding, 2011	UR	UR	UR	HR	HR	HR	HR	LR
Hawkins et al. 1988	UR	UR	LR	LR	UR	HR	HR	LR
Hirsch et al. 2011	LR	LR	LR	LR	LR	UR	HR	LR
Hostetler & Fisher 1997	UR	UR	UR	HR	HR	HR	HR	LR
Ialongo et al. 2001	UR	UR	LR	LR	UR	HR	HR	LR
Johnson, 1983	LR	LR	LR	LR	LR	HR	HR	LR
Lewis et al. 2013	LR	LR	UR	LR	LR	HR	LR	LR