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Table 4 Multivariable logistic regression analysis predicting risk factors for ectopic pregnancy

From: Risk factors for ectopic pregnancy: a multi-center case-control study

  AOR [95 % CI] p value
Education attainment
 Collage or above Reference <10−3
 High school 1.21 [0.97, 1.50]
 Middle school 0.96 [0.74, 1.24]
 Primary school or lower 1.47 [1.23, 1.75]
Occupation
 Employed Reference <10−2
 Self-employed 1.30 [1.02, 1.66]
 Unemployed 1.33 [1.10, 1.62]
Previous ectopic pregnancy
 No Reference <10−3
 Yes 2.72 [1.83, 4.05]
Serum Chlamydia trachomatis IgG test
 Negative Reference <10−3
 Positive 3.18 [2.64, 3.84]
Previous infertility
 No Reference <10−3
 Yes 2.18 [1.66, 2.88]  
ART applied in the current cycle of conception
 Spontaneous pregnancy Reference <10−3
 IVF-ET 9.28 [2.14, 40.38]
 Other ARTsa 0.80 [0.34, 1.88]
 Chinese herb 0.80 [0.41, 1.56]
Previous adnexal surgery   
 No Reference <10−3
 Yes 2.09 [1.49, 2.93]
Previous appendectomy   
 No Reference 0.01
 Yes 1.64 [1.13, 2.37]
Previous use of IUDs   
 No Reference <10−3
 Yes 1.72 [1.39, 2.13]
Previous use of other contraceptive methodsb   
 No Reference <10−3
 Yes 0.56 [0.47, 0.66]
Current contraceptive methods   
 No Reference <10−3
 Other contraceptive methodsb 1.22 [0.99, 1.44]
 OCPs 3.02 [1.16, 7.86]
 LNG-EC 4.75 [3.79, 5.96]
 IUDs 16.43 [10.42, 25.89]
 Female sterilization 4.73 [1.04, 21.52]
  1. AOR adjusted odds ratio, CI confident interval, ART assisted reproduction technology, IVF-ET in vitro fertilization and embryo transfer, IUDs intrauterine devices, LNG-EC levonorgestrel emergency contraception, OCPs oral contraceptive pills
  2. aOther ARTs includes ovarian stimulation, intrauterine insemination, luteal phase support and combination of ovarian stimulation and luteal phase support
  3. bOther contraceptive methods includes condom, rhythm method, withdrawal