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| Methods | RCT | |
| Participants | CAF | |
| Interventions | Open (20) vs. Closed using RFA (20) internal sphincterotomy | |
| Outcomes | Healing | |
| Notes | 5 drop outs not analysed as ITT All healed at 30 d | |
| 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 | Low risk | adequate |
| Drop‐outs All outcomes | High risk | 5/40 = 12.5% |
