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

Chen 2008

Methods Women were randomly allocated to 2 groups. Method of randomisation not reported
Participants 273 women attending in a family planning clinic, Tongxiang, Zhejiang, China. Women had regular menstrual periods and a single act of unprotected intercourse within 72 h of attending the clinic
Interventions Mife 25 mg, single dose vs LNG 0.75 mg, 2 doses   
Outcomes Observed number of pregnancies, side effects and changes in menstrual pattern
Notes

  1. Observed pregnancy/total number of women: Mife: 2/129;  LNG: 3/136

  2. Side effects:

    1. Mife: total side effect 14/129;

    2. LNG: total side effect 53/136

  3. Changes in menstrual pattern: 

    1. Early: Mife 8/118; LNG 7/125

    2. Delay: Mife 13/118; LNG 1/125
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