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| Methods | RCT | |
| Participants | CAF | |
| Interventions | Length of sphincter division: to apex or to achieve 30 mm aperture | |
| Outcomes | healing of the fissure, incontinence score, aperture size over time. | |
| Notes | ||
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Low risk | specified and adequate randomisation method |
| Blinding of outcome assessment (detection bias) All outcomes | High risk | inadequate |
| Drop‐outs All outcomes | Low risk | 3/61 = 4.9% |
