Tao 2014

Methods	Women randomly allocated into 2 groups. Method of randomisation not reported
Participants	150 Women attending the maternity and child health hospital in Hubei Included sexually active women aged 18‐45 years having regular menstrual cycles of 30 ± 7 days. Women had a single act of unprotected intercourse within 120 h of attending the hospital Exclusion criteria were breast‐feeding women, hormonal contraindication in their current cycle, use of hormonal contraceptives, having irregular menstrual cycles
Interventions	Mife 30 mg, single dose, orally vs LNG 0.75 mg, 2 doses, 12 h apart
Outcomes	Observed number of pregnancies, side effects and changes in menstrual pattern
Notes	Post‐randomisation exclusion and loss to follow‐up not reported Observed pregnancy/expected pregnancy/total number of women: Mife 1/7/76; LNG 2/7/74
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Mentioned randomisation but description not adequate
Allocation concealment (selection bias)	Unclear risk	Method of allocation concealment not mentioned
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Not mentioned
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Post‐randomisation exclusion and loss to follow‐up not reported
Selective reporting (reporting bias)	Low risk	Reported planned outcomes
Other bias	Low risk	None detected