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. 2017 Aug 2;2017(8):CD001324. doi: 10.1002/14651858.CD001324.pub5

Cheng 2009

Methods Women were randomly allocated to 2 groups. Method of randomisation not reported
Participants 166 women attending in an obs/gyn clinic, Huadu District Hospital, Guangzhou, China. Women had regular menstrual periods and a single act of unprotected intercourse within 72 h of attending the clinic
Interventions LNG 0.75 mg in 2 doses vs Mife 25 mg single dose
Outcomes Observed number of pregnancies, side effects and changes in menstrual pattern
Notes

  1. Observed pregnancy/total number of women: LNG 9/83; Mife 12/83

  2. Side effects: no data

  3. Changes in menstrual pattern: 

    1. Delay: LNG 6/74;  Mife 12/71
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 No mention of post‐randomisation exclusion and loss to follow‐up
Selective reporting (reporting bias) Low risk Planned outcome of pregnancy rate was reported
Other bias Low risk None detected