Study | Randomly assigned | Allocation concealment | Multi- center | Blinding | Complete outcome data adequately addressed | Free of selective outcomes reporting | Other bias | Intention to treat | Sample size calculation | Power | Conflict of interest |
---|---|---|---|---|---|---|---|---|---|---|---|
Boushey 2005 [8] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | No | Yes | 0.90 | No |
Huang 2003 [9] | Yes | Yes | No | Double-blind | Yes | Unclear | Unclear | No | No | NA | No |
Brabson 2002 [10] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | Yes | Yes | 0.80 | No |
Nathan 2001 [11] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | No | Yes | 0.80 | No |
Busse 2001 [12] | Yes | Yes | No | Double-blind | Yes | Unclear | Unclear | No | Yes | 0.80 | No |
Kim 2000 [13] | Yes | Yes | No | Double-blind | Yes | Unclear | No | Yes | Yes | 0.80 | No |
Virchow 2000 [14] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | No | No | NA | No |
Bleecker 2000 [15] | Yes | Yes | Yes | Double-blind | Yes | Unclear | No | Yes | Yes | 0.80 | No |
Busse 1999 [16] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | Yes | Yes | 0.80 | No |
Nathan 1998 [17] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | No | Yes | 0.90 | No |
Fish 1997 [18] | Yes | Yes | Yes | Double-blind | Yes | Unclear | Unclear | No | Yes | 0.90 | No |
Spector 1994 [19] | Yes | Yes | Yes | Double-blind | Yes | Unclear | No | No | Yes | 0.90 | No |