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quality assessment of case-control studies
| First author | Case definition | Representativeness | Selection of controls | Definition of controls | Comparability | Ascertainment of exposure | Same method of ascertainment | Non-response rate | score |
|---|---|---|---|---|---|---|---|---|---|
| Salehi | a | a | a | a | a | c | a | b | 6 |
| Rejali | a | a | a | a | a | c | a | b | 5 |
| Ramagopalan | a | a | a | a | a | c | a | b | 6 |
