El‐Nashar 2011.

Methods	RCT Single centre Egypt
Participants	Included women with primary infertility undergoing ICSI cycle; no other criteria mentioned Exclusion criteria: not mentioned
Interventions	Intervention group (N = 62) underwent hysteroscopy and directed endometrial biopsy before ICSI. Any uterine abnormalities found were corrected. Control group (N = 62): no hysteroscopy
Outcomes	Clinical pregnancy rate, normal and abnormal hysteroscopy findings
Notes	This was published as a conference abstract. There was no response from authors to email queries regarding participants and data.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Authors use "randomized" in the abstract. However, information provided was insufficient for making a judgement.
Allocation concealment (selection bias)	Unclear risk	Not mentioned
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Blinding was not mentioned. However, absence of blinding was unlikely to influence performance bias. Hence, absence of blinding was categorised as low risk for performance bias.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Blinding was not mentioned. However, absence of blinding was unlikely to influence the findings for our primary and secondary outcomes, hence, categorised as low risk for detection bias.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No information provided regarding losses to follow‐up or dropouts. Insufficient information for making a judgement
Selective reporting (reporting bias)	Unclear risk	No published protocol. While all the prespecified outcomes were reported, primary outcome (live birth) was not reported.
Other bias	Unclear risk	There was not enough information to make a judgement. This was a conference abstract.