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 |
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| 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 |