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. 2012 Dec 12;2012(12):CD001894. doi: 10.1002/14651858.CD001894.pub5

Stein 1995.

Methods Single centre, randomised trial
Participants 154 women from Israel with repeated implantation failure (> 3 attempts) undergoing IVF 
 Mean age not stated
Interventions AH (mechanical; complete zona breach; ? hours egg retrieval to AH; 1.5 hours AH to transfer) versus no AH 
 AH: 72 women randomised, 230 embryos transferred 
 Control: 82 women randomised, 295 embryos transferred
Outcomes Clinical pregnancy, miscarriage
Notes Attempted to contact author about this study, no reply received
Unclear if power calculation performed 
 ITT analysis unclear 
 Published as full paper
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Unclear risk Randomisation stated, but method unclear 
 or incorrect
Allocation concealment (selection bias) Unclear risk Unclear, no details
Blinding (performance bias and detection bias) 
 All outcomes Unclear risk Participants not blinded or unclear 
 Assessor not blinded or unclear
Incomplete outcome data (attrition bias) 
 All outcomes Unclear risk ITT analysis unclear
Selective reporting (reporting bias) High risk Original protocol not viewed but authors did not report on live birth