Toplis 1988.

Methods	Randomisation not specified. Concealment of allocation by envelope opened immediately before operation
Participants	200 non pregnant women at the Churchill Hospital, Oxford
Interventions	Spring‐loaded clip (Hulka‐Clemens) versus Filshie clip (titanium clip) via laparoscopy
Outcomes	Operative morbidity, operative time, complaints
Notes	Interval sterilisation Authors as the only surgeons
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not described
Allocation concealment (selection bias)	Low risk	Concealment of allocation by envelope opened immediately before operation
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Not described
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Two women from the Hulka clip group were excluded from the study because of technical failure
Selective reporting (reporting bias)	Unclear risk	Unable to determine
Other bias	Unclear risk	Unable to determine. Women in the Filshie group were slightly heavier than those in the Hulka clip group