Risk of bias category | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
---|
Was the allocation sequence adequately generated? | U | L | L | L | L | L | L | L | L | U | L | H | U | H |
Was the allocation adequately concealed? | L | L | L | L | L | L | U | L | L | U | U | H | U | U |
Were baseline outcome measurements similar? | L | U | U | L | U | L | H | L | L | H | H | L | H | H |
Were baseline characteristics similar? | L | U | U | L | L | L | L | L | L | H | H | L | H | L |
Were incomplete outcome data adequately addressed? | L | L | L | L | H | H | L | H | H | L | U | H | H | H |
Was knowledge of the allocated intervention adequately prevented during study? | L | L | L | H | L | U | U | L | L | L | U | U | U | U |
Was the study adequately protected against contamination? | L | L | L | L | L | L | L | L | L | L | L | L | L | U |
Was the study free from selective outcome reporting? | L | L | L | L | L | L | L | L | L | L | L | L | L | L |
Was the study free from other risk of bias? | L | L | L | L | L | L | L | H | H | L | L | L | L | L |
Abbreviations: 1 – Winkens et al., [
47]; 2 – Eccles et al., [
24]; 3 – Kerry et al., [
22]; 4 – Dey et al., [
29]; 5 – Bekkering et al., [
26]; 6 – Engers et al., [
46]; 7 - Bishop & Wing, [
28]; 8 – Bekkering et al., [
45]; 9 – Engers et al., [
27]; 10 – Stevenson et al., [
30]; 11 - Schectman et al., [
23]; 12 – McGuirk et al., [
32]; 13- Becker et al., [
44]; 14 – Goldberg et al., [
31]; H – High risk of bias; L – Low risk of bias; U – Unclear risk of bias