Table 2.
Quality assessment of Case control and Cohort studies
| Author | Quality assessment of case control studies | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Is the case definition adequate? | Representativeness of the cases | Selection of controls | Definition of controls | Comparability of cases and controls on basis of design or analysis | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non-Response rate | Total Newcastle Ottawa Scale (possible 9 starts) | |
| Barrack et al. (2001) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 8* |
| Bell et al. (2014) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 8* |
| Czurda et al. (2010) | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | 7* |
| Magnussen et al. (2011) | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | 7* |
| Matziolis et al. (2010) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 8* |
| Nicoll and Rowley (2010) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 8* |
| Stulberg et al. (2008) | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 8* |
Assessed using the Ottawa-Newcastle score (Viswanathan et al. 2008a)
* Represents how many stars were achieved in the assessment of quality for each study