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Measures of binary outcomes in 520 abstracts of research papers. Values are numbers (percentages)
| Measure | Randomised trials (n=260) | Cohort studies (n=130) | Case-control studies (n=130) |
|---|---|---|---|
| Relative risk | 135 (52) | 46 (35) | 5 (4) |
| Odds ratio | 116 (45) | 79 (61) | 125 (96) |
| Hazard ratio | 9 (3) | 3 (2) | 0 |
| Standardised mortality ratio | 0 | 2 (2) | 0 |
