Table 5 Summary of results on quality assessment
| Â | Selection bias N (%) | Study design N (%) | Confounders N (%) | Data collection methods N (%) | Withdrawals and drop-outs N (%) | Global rating N (%) |
|---|---|---|---|---|---|---|
Strong quality | 3 (7%) | 29 (66%) | 29 (66%) | 24 (55%) | 15 (34%) | 5 (12%) |
Moderate quality | 18 (41%) | 15 (34%) | 2 (5%) | 6 (14%) | 20 (45%) | 23 (52%) |
Weak quality | 23 (52%) | 0 (0%) | 13 (30%) | 14 (32%) | 9 (20%) | 16 (36%) |