Bellinge 1986.

Methods	Parallel group study Number of women randomised: 152 (78 in the intervention group; 74 in the control group) Number of women analysed: 113
Participants	Country of authors: Australia Inclusion criteria: couples undergoing assisted reproduction with fresh ejaculate sperm Exclusion criteria: none reported Mean age (SD not stated): intervention group: 32.2 years; control group: 31.9 years Mean duration of infertility: not stated Women with primary infertility: not reported Setting: assisted reproduction programme in Western Australia
Interventions	Intervention: untreated fresh ejaculate was inseminated in the vagina at the time of oocyte fertilisation Control: women in both groups were instructed to abstain from vaginal intercourse 4 days before oocyte pick‐up
Outcomes	Clinical pregnancy defined as the presence of a gestational sac
Notes	We were unable to contact the authors
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random numbers table was used
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not reported
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Objectively measured outcome
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	10 to 30% of participants excluded after commencement, but similar proportions in both control and intervention groups. ITT analysis was presented
Selective reporting (reporting bias)	Low risk	Clinical pregnancy rate reported
Other bias	Low risk	No other cause of potential bias identified