Table 2.
Results of Newcastle-Ottawa Quality Assessment Scale.
| Author (Year) | Selection | Comparability | Ecposure | Score | |||||
|---|---|---|---|---|---|---|---|---|---|
| case definition adequate? | Representativeness of the cases | Selection of Controls | Definition of Controls | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non-Response rate | |||
| Tafiadis et al. (2017) | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
| Simberg et al. (2015) | ★ | ★ | ★ | ★ | 4 | ||||
| Pinar et al. (2016) | ★ | ★ | ★ ★ | ★ | ★ | ★ | 6 | ||
| Glas et al. (2008) | ★ | ★ | ★ ★ | ★ | ★ | ★ | 7 | ||
| Hamdan et al. (2011) | ★ | ★ | ★ ★ | ★ | ★ | ★ | 7 | ||
| Awan. (2011) | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
| Hamdan et al. (2010) | ★ | ★ | ★ ★ | ★ | ★ | ★ | 7 | ||
| Lee et al. (2008) | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||
| Gonzalez et al. (2004) | ★ | ★ | ★ | ★ | ★ | ★ | 6 | ||