Table 2.
Bias observed in clinical trials included in systematic review.
| Adequate sequence generation? | Allocation concealment? | Blinding? | Incomplete outcome data? | Selective reporting? | Free of other bias? | |
|---|---|---|---|---|---|---|
| Malekzadeh et al (2010) | Yes | Yes | Yes | No | No | Unclear |
| Yusuf et al (2012) (Multicentric, India) |
Yes | No | No | No | No | Yes |
| Soliman et al (2011) (Muticentric open label, Sri Lanka) |
Yes | No | No | Yes | Yes | Yes |
| PILL Collaborative Group (2011) (Multicentric, international) | Yes | Yes | Yes | No | Yes | Unclear |
| Wald et al (2012) Cross over | Yes | Yes | Yes | Yes | Yes | Unclear |
| The Indian Polycap Study (TIPS) Investigators (2009) (Multicentric, India) | Yes | Yes | Yes | Yes | Yes | Unclear |