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Table 2 History of reproduction, gynecology, and surgery of all enrolled participates

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

  EP IUP OR [95 % CI] p value
n a (%) n a (%)
Reproductive history
 Number of previous abortions
  0 873 (36.88) 930 (38.49) Reference 0.71
  1 763 (32.23) 756 (31.29) 1.08 [0.94, 1.23]
  2 485 (20.49) 497 (20.57) 1.04 [0.89, 1.21]
   ≥ 3 246 (10.39) 233 (9.64) 1.13 [0.92, 1.38]
 Parity
  0 1143 (48.29) 1280 (52.98) Reference <10−3
  1 994 (41.99) 973 (40.27) 1.14 [1.02, 1.30]
   ≥ 2 230 (9.72) 163 (6.75) 1.58 [1.27, 1.96]
Gynecologic history
 Previous EP
  No 2093 (86.81) 2363 (97.81) Reference <10−3
  Yes 318 (13.19) 53 (2.19) 6.77 [5.04, 9.11]
 Serum Chlamydia trachomatis IgG test
  Negative 1648 (69.13) 2099 (89.55) Reference <10−3
  Positive 736 (30.87) 245 (10.45) 3.83 [3.27, 4.48]
 Previous infertility
  No 2005 (83.26) 2286 (95.65) Reference <10−3
  Yes 403 (16.74) 104 (4.35) 4.42 [3.53, 5.53]
 Categories of infertility
  No 2005 (83.26) 2286 (95.65) Reference <10−3
  Tubal infertility 326 (13.54) 73 (3.05) 5.09 [3.92, 6.61]
  Non-tubal infertility 77 (3.20) 31 (1.30) 2.83 [1.86, 4.32]
   ARTs applied in the current cycle of conceptionb
    Spontaneous pregnancy 278 (68.98) 72 (69.23) Reference <10−3
    IVF-ET 58 (14.39) 3 (2.88) 5.01 [1.53, 16.44]
    Other ARTsc 46 (11.41) 18 (17.31) 0.66 [0.36, 1.21]
    Chinese herb 21 (5.21) 11 (10.58) 0.49 [0.23, 1.07]
Surgical history
 Previous cesarean sectiond
  No 691 (56.09) 624 (54.74) Reference 0.79
  Yes 541 (43.91) 516 (45.26) 0.95 [0.81, 1.11]
 Previous adnexal surgery
  No 1985 (82.33) 2322 (96.19) Reference <10−3
  Yes 426 (17.67) 92 (3.81) 5.42 [4.29, 6.84]
   Specific adnexal surgerye
    Ovarian surgery 64 (15.02) 36 (39.13) 2.08 [1.38, 3.14] <10−3
    Surgery for EP 237 (55.62) 38 (41.30) 7.30 [5.15, 10.33]
    Tubal reconstructive surgery 90 (21.13) 14 (15.22) 7.52 [4.27, 13.25]
    Female sterilization 21 (4.93) 2 (2.17) 12.28 [2.88, 52.45]
    Reversal of tubal sterilization 14 (3.29) 2 (2.17) 8.19 [1.86, 36.07]
  Previous appendectomy
  No 2303 (95.84) 2346 (97.47) Reference 0.01
  Yes 100 (4.16) 61 (2.53) 1.67 [1.21, 2.31]
  1. EP ectopic pregnancy, IUP intrauterine pregnancy, OR odds ratio, CI confidence interval, ART assisted reproduction technology, IVF-ET in vitro fertilization and embryo transfer
  2. aThe sum does not necessarily equal the sample size for all variables because of missing data
  3. bThe number of women with history of infertile was used as the denomintor to calculate the percentage
  4. cOther ARTs includes ovarian stimulation, intrauterine insemination, luteal phase support and combination of ovarian stimulation and luteal phase support
  5. dThe number of women having delivered a child was used as the denomintor to calculate the percentage
  6. eThe number of women experienced adnexal surgeries was used as the denomintor to calculate the percentage