Balaban 2006.

Methods	Randomisation by computer‐generated numbers
Participants	366 women from Turkey undergoing ICSI treatment only Exclusion: women undergoing IVF
Interventions	AH (laser thinning) n = 183 versus No AH (laser thinning) n = 183 Unclear on how long before transfer, frozen‐thawed embryos only
Outcomes	Primary: implantation rate, Secondary: clinical pregnancy, miscarriage and multiple pregnancy rate
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomisation by computer‐generated numbers
Allocation concealment (selection bias)	Unclear risk	No details in text
Blinding (performance bias and detection bias) All outcomes	Unclear risk	No details on blinding
Incomplete outcome data (attrition bias) All outcomes	Low risk	There were no losses to follow up and all women were analysed
Selective reporting (reporting bias)	Unclear risk	The original protocol was not viewed but all outcomes listed in the methods section were reported. Live birth was not reported