Rufas‐Sapir 2004.

Methods	Unknown randomisation method and allocation concealment. occurred on day of embryo transfer
Participants	207 women 3 consecutive failed IVF cycles All ages Undergoing IVF only
Interventions	Mechanical partial zonal dissection: complete breach technique versus control AH ‐ 104 women Control ‐ 103 women
Outcomes	Clinical pregnancy, miscarriage
Notes	Author response AH 3.4; ET Control 3.7
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Unknown randomisation method
Allocation concealment (selection bias)	Unclear risk	Unknown allocation concealment
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Unclear
Incomplete outcome data (attrition bias) All outcomes	Low risk
Selective reporting (reporting bias)	Unclear risk	Unclear