Boulos 1984.
Methods | Randomized controlled trial | |
Participants | Patients with chronic anal fissure | |
Interventions | Open (14) versus subcutaneous (14) partial lateral internal sphincterotomy | |
Outcomes | Persistence of the fissure and incontinence to flatus | |
Notes | ||
Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Low risk | pulling classification cards once surgery had been determined to be necessary |
Blinding of outcome assessment (detection bias) All outcomes | High risk | inadequate |
Drop‐outs All outcomes | Low risk | zero |