Table 1 Newcastle-Ottawa scale
Study | Is the case definition adequate? | Representativeness of the cases | Selection of Controls | Definition of Controls | Comparability of cases and controls on the basis of the design or analysis | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non-Response rate | Scores |
|---|---|---|---|---|---|---|---|---|---|
Sankineani et al 2018 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
Sankineani et al 2017 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Gwam et al 2016 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 7 |