Janko 1998.

Methods	Trial design: parallel Single centre, Slovakia
Participants	Couples with unexplained subfertility N randomised: 72 Age: not stated Duration of subfertility: > 3 yrs Basic fertility work‐up normal, semen normal not further specified Previous treatment: not stated
Interventions	Comparison: IUI + OH versus TI + OH Stimulation method: hMG (10 amp per cycle) Ovulation: 10,000 IU hCG Timing: not specified No cancellation criteria were given Duration of treatment: 3 cycles max
Outcomes	PR per cycle Pregnancy not further defined
Notes	ITT analysis: possible Abstract only Data calculated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not stated
Allocation concealment (selection bias)	Unclear risk	Unclear; not stated
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Blinding was not possible because of the nature of the interventions
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Blinding was not possible because of the nature of the interventions and non‐blinding was not likely to affect the outcomes of interest
Incomplete outcome data (attrition bias) All outcomes	High risk	Not available
Selective reporting (reporting bias)	High risk	In this abstract the reported outcome data are minimal
Other bias	Unclear risk	Insufficient information available to evaluate this risk domain