Table 2 Quality assessment of studies included in the meta-analysis
Study | Adequate sequence generation | Allocation concealment | Blinding | Incomplete outcome data addressed | Selective outcome reporting | Free of other bias | Summary risk of bias |
|---|---|---|---|---|---|---|---|
Prakash et al. [22], 2008 | Yes | Yes | Yes | Yes | Yes | Yes | Low |
Kantorova et al. [23], 2004 | Yes | Yes | Yes | Yes | Yes | Yes | Low |
Darlong et al. [24], 2003 | Yes | Unclear | Unclear | Yes | Yes | Unclear | Unclear |
Cook et al. [16], 1998 | Yes | Yes | Yes | Yes | Yes | Yes | Low |
Thomason et al. [25], 1996 | Yes | Yes | Yes | Yes | Yes | Yes | Low |
Prod'hom et al. [26], 1994 | Yes | Yes | Yes | Yes | Yes | Yes | Low |
Pickworth et al. [27], 1993 | Yes | Yes | Yes | Yes | Yes | Yes | Low |
Ruiz-Santana et al. [28], 1991 | Yes | Unclear | Yes | Yes | Yes | Unclear | Unclear |
Eddleston et al. [29], 1991 | Yes | Unclear | Yes | Yes | Yes | Unclear | Unclear |
Laggner et al. [30], 1989 | Yes | Unclear | Yes | Yes | Yes | Unclear | Unclear |