Sagoskin 2007.

Methods	Randomised trial
Participants	199 women from USA undergoing IVF or ICSI Good prognosis group with only one previous implantation failure Fresh embryo transfer cycles only
Interventions	Laser hatching (breach with hole) AH: 121 randomised, 118 analysed, 254 embryos; Control: 82 randomised, 81 analysed, 170 embryos
Outcomes	Live birth, clinical pregnancy, miscarriage and multiple pregnancy rate
Notes	No author contact as all details clearly stated in article ET: AH 2.2 (0.4); Control 2.1 (0.3) Power calculation not reported Published as a full paper
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Treatment assignments were determined by a computer‐generated randomised series in a 2:1 ratio of treatments to controls
Allocation concealment (selection bias)	Unclear risk	Not stated within the text
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Not stated within the text
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	ITT unclear
Selective reporting (reporting bias)	Low risk	Live birth reported