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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