Table 1.
Examples of unclear supporting explanations
| Study number | Unclear supporting explanation | Judgment |
|---|---|---|
| 2 | All participants were accounted for | Low |
| 12 | Outcomes reported for all women randomized | Low |
| 20 | Primary outcomes were reported | Low |
| 26 | None found | Low |
| 54 | Analysed the same number of participants in both groups | Low |
| 66 | Expected outcomes reported. Response rates reduced in patients over 4 surveys | Low |
| 80 | No study protocol was available | Low |
| 82 | It appears that all participants completed the study and contributed data for each outcome at all relevant time points | Low |
| 2 | Unclear | Unclear |
| 4 | Losses to follow-up were unclear | Unclear |
| 6 | It was unclear whether or not there was attrition, or loss to follow-up at final follow-up based on the results section | Unclear |
| 29 | No information | Unclear |
| 31 | Insufficient information to permit judgment of low risk or high risk | Unclear |
| 32 | May be participants randomized who did not complete | Unclear |
| 41 | Few data available in conference abstract only | Unclear |
| 66 | Unknown | Unclear |
| 442 | High attrition (41%) | Unclear |
| 13 | Number of drop-outs reported, but no details | High |
| 25 | Not all raw data were provided | High |
| 52 | Not clear how many withdrew | High |