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Table 3 Previous and current use of contraception

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

  EP IUP OR [95 % CI] p value
n a (%) n a (%)
Previous use of contraceptives
 LNG-EC
  No 1283 (53.57) 1311 (54.74) Reference 0.53
  Yes 1112 (46.43) 1084 (45.26) 1.05 [0.94, 1.17]
 IUDs
  No 1993 (83.74) 2106 (88.27) Reference <10−3
  Yes 387 (16.26) 280 (11.74) 1.48 [1.25, 1.74]
 OCPs
  No 2254 (94.47) 2295 (95.55) Reference 0.06
  Yes 132 (5.53) 107 (4.45) 1.25 [0.97, 1.63]
 Other contraceptive methodsb
  No 829 (35.32) 421 (17.50) Reference <10−3
  Yes 1518 (64.68) 1985 (82.50) 0.39 [0.34, 0.45]
Current contraceptive methods
 No 1337 (55.87) 1585 (65.60) Reference <10−3
 Other contraceptive methodsb 447 (18.68) 653 (27.03) 0.81 [0.71, 0.93]
 OCPs 16 (0.67) 7 (0.29) 2.71 [1.11, 6.61]
 LNG-EC 341 (14.25) 145 (6.00) 2.79 [2.27, 3.43]
 IUDs 231 (9.65) 24 (0.99) 11.41 [7.45, 17.48]
 Female sterilizationc 21 (0.88) 2 (0.08) 12.45 [2.91, 53.18]
  1. EP ectopic pregnancy, IUP intrauterine pregnancy, OR odds ratio, CI confidence interval, IUDs intrauterine devices, LNG-EC levonorgestrel emergency contraception, OCPs oral contraceptive pills
  2. aThe sum does not necessarily equal the sample size for all variables because of missing data
  3. bOther contraceptive methods includes condom, rhythm method, withdrawal
  4. cWomen who received reversal of tubal sterilization (n = 16) are not included here