Table 2.
Summary of risk of bias assessment
| Risk of bias criterion | Taylor et al18 | Stevens et al20 | Harrison et al21 | Isaacs et al22 | Sorensen et al23 | Gusi et al8 | Jolly et al26 | Murphy et al27 |
|---|---|---|---|---|---|---|---|---|
| Method of random sequence generation described | Yes | Yes | Yes | Yes | Yes | Yes | Yes* | Yes |
| Method of allocation concealment described | Yes* | Yes | Unclear | Unclear | Yes | Yes | Yes* | Yes |
| Method of outcome (assessment) blinding described | Unclear | Unclear | Unclear | No | Unclear | Unclear | Yes | Yes |
| Groups similar at baseline | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Intention to treat analysis used | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Any statistical handling of missing data | Unclear | Yes | Unclear | Yes | Yes | Yes | Yes | Yes |
| Missing data reported (dropout and loss to follow-up) | Yes* | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
*From correspondence with author.