Baseline characteristics (socio-demographic characteristics).
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EP, ectopic pregnancy; IUP, intrauterine pregnancy; NonP, nonpregnancy; LNG-EC, levonorgestrel emergency contraception.aThe sum does not necessarily equal the sample size for all variables because of missing data.bOccasional smoker: cigarette smoking more than 4 times a week but an average of less than one cigarette per day. Regular smoker: smoking more than one cigarette per day continuously or over a 6-month period.cCenter 1 = International Peace Maternity and Child Health Hospital; Center 2 = Shanghai First People’s Hospital; Center 3 = Songjiang Central Hospital; Center 4 = Songjiang Maternity and Child Health Hospital; Center 5 = Minhang Central Hospital.Baseline characteristics (socio-demographic characteristics).
创建时间：
2015-12-02
