References | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Blinding of participants and personnel (performance bias) | Blinding of outcome assessment (detection bias) | Incomplete outcome data (attrition bias)†| Selective reporting (reporting bias)‡ | Validated assessment instruments of outcome used§ |
---|---|---|---|---|---|---|---|
McCombie et al. [51] | + | −a | −b | ?c | + | ?q | + |
Mikocka-Walus et al. [46] | + | −d | −e | ? | + | + | + |
Mikocka-Walus et al. [45] | + | −d | +e | ? | + |  +  | + |
Wynne et al. [49] | + | −f | ? | ? | + | + | + |
EVA Szigethy et al. [44] | ? | ? | ? | + | + | + | + |
Berrill et al. [50] | + | −g | ? | ? | + | + | + |
+ | ? | ?j | +k | +l | + | + | |
Stapersma et al. [47] | + | ? | +m | ? | +l | + | + |
Hunt et al. [42] | + | +n | ? | ? | + | ?q | + |
Levy et al. [43] | + | +o | ? | +p | + | + |  +  |
Thompson et al. [41] | ? | ? | ? | ? | + | + | + |