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 | Â | Â |
 No | Reference | <10−3 |
 Yes | 2.09 [1.49, 2.93] | |
Previous appendectomy | Â | Â |
 No | Reference | 0.01 |
 Yes | 1.64 [1.13, 2.37] | |
Previous use of IUDs | Â | Â |
 No | Reference | <10−3 |
 Yes | 1.72 [1.39, 2.13] | |
Previous use of other contraceptive methodsb | Â | Â |
 No | Reference | <10−3 |
 Yes | 0.56 [0.47, 0.66] | |
Current contraceptive methods | Â | Â |
 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] |