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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