Table 2 quality assessment of case-control studies
From: Age at menarche and risk of multiple sclerosis (MS): a systematic review and meta-analysis
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 |