Table 2 Quality of controlled studies passing eligibility criteria presented by stratification of research methodology and Newcastle-Ottawa scale a (for non-randomised observational studies)
| Author/Year | Design | Randomisation | Blinding | Sample size estimation | Analysis | Newcastle-Ottawa scale | ||
|---|---|---|---|---|---|---|---|---|
| Selection | Comparability | Outcome | ||||||
| Barad D, et al. (2007) | Case -control study | None | None | N/A | Intention to treat analysis | *** | * | ** |
| Wiser A, et al. (2010) | Randomised controlled study | -Computer generated random numbers | None | Not done | Intention to treat analysis | |||
| - allocation concealment by sealed envelope | (No-drop out) | |||||||
| Gleicher N, et al. (2010) | Case -control study | None | None | N/A | Intention to treat analysis | *** | * | *** |