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Study design and study-level risk of bias, stratified by Abstrackr’s relevance predictions
| Study characteristic | N studies | Correctly predicted as relevant, n (%) | Incorrectly predicted as irrelevant, n (%) | P valuea |
|---|---|---|---|---|
| Design | ||||
| Trial | 483 | 438 (91) | 45 (9) | 0.0006 |
| Observational | 214 | 169 (79) | 45 (21) | |
| Mixed methods | 2 | 2 (100) | 0 (0) | |
| Qualitative | 15 | 14 (93) | 1 (7) | |
| Review | 88 | 73 (83) | 15 (17) | |
| Risk of bias | ||||
| Low | 120 | 96 (80) | 24 (20) | 0.039 |
| High or unclear | 500 | 438 (88) | 62 (12) | |
aFisher’s exact test
