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Table 3 Significant associations of cases and controls among ever-users of contraception for unsafe abortion

From: Risk of unsafe abortion associated with long-term contraception behaviour: a case control study from Sri Lanka

Risk factor

Cases

N = 160

Controls

N = 549

Crude OR

(95% CI)

Adjusted OR (95% CI)

Model 3a

Adjusted OR (95% CI)

Model 4b

Adjusted OR (95% CI)

Model 5c

No.

%

No.

%

Long-term contraceptive practices

 Early discontinuation

45

26.3%

80

13.3%

3.0 (1.9–4.7)

 

1.75 (1.1–3.2)

4.9 (1.7–14.4)

 Late discontinuation

47

27.5%

107

17.8%

2.3 (1.5–3.6)

 

2.3 (1.4–3.6)

3.5 (1.6–7.6)

 Ineffective use (Reference)

68

39.8%

362

60.3%

1.00

-

1.00

1.00

Type of contraceptive last used

 Modern method

117

73.1%

349

63.6%

1.6 (1.1–2.3)

   

 Traditional method (Reference)

43

26.9%

200

36.4%

1.00

NSe

NSe

NSe

Interaction (Contraceptive practice & Type of contraceptive (n = 378)

Early discontinuation & modern method

37

39.8%

60

21.0%

   

1.4 (1.1–3.1)

Late discontinuation & modern method

34

36.6%

76

26.7%

   

1.7 (0.8–5.0)

Ineffective use & traditional method (Reference)

22

23.6%

149

52.3%

-

-

-

1.00

Secondary education

 Not completed

105

67.6%

300

54.7%

1.6 (1.1–2.3)

1.6 (1.1–2.5)

1.6 (1.1–2.4)

1.7 (1.1–2.5)

 Completed (Reference)

55

32.4%

249

45.3%

1.00

1.00

1.00

1.00

Currently employed

 Yes

64

40.0%

140

25.5%

1.9 (1.3–2.8)

1.7 (1.1–2.5)

1.8 (1.2–2.7)

1.8 (1.2–2.7)

 No (Reference)

96

60.0%

409

74.5%

1.00

1.00

1.00

1.00

Current marital status

 Single/divorce/separate/widow

29

18.1%

10

1.8%

11.9 (5.7–25)

9.4 (4–21.9)

9.3 (3.9–22.4)

9.9 (4.1–24.3)

 Married (Reference)

131

81.9%

539

98.2%

1.00

1.00

1.00

1.00

Fertility behaviour

 No informed decision on family size

79

49.4%

145

26.4%

2.3 (1.5–3.7)

2.1 (1.3–3.4)

1.9 (1.2–3.2)

1.9 (1.1–3.1)

 Informed decision made:

  Family completed

40

25.0%

224

40.8%

0.8 (0.5–1.3)

0.8 (0.5–1.4)

0.9 (0.5–1.4)

0.8 (0.5–1.4)

  Family not completed (Reference)

41

25.6%

180

32.8%

1.00

1.00

1.00

1.00

Gravid statusd

 

 Primigravid

36

22.5%

83

15.1%

1.6 (1.1–2.5)

2.5 (1.3–4.8)

2.8 (1.1–5.6)

2.1 (1.0–4.4)

 Non-primigravid (Reference)

124

77.5%

466

84.9%

1.00

1.00

1.00

1.00

At least one female child present

 

 No

84

52.5%

194

35.3%

2.0 (1.4–2.9)

2.2 (1.4–3.4)

2.1 (1.3–3.3)

2.1 (1.3–3.3)

 Yes (Reference)

76

47.5%

355

64.7%

1.00

1.00

1.00

1.00

  1. aLR Model 3 showing adjusted odds ratio (OR) of the factors significant for unsafe abortion among ever-users of contraception: education, employment, marital status, gravid status, fertility behaviour, female child and type of contraceptive last used as the independent variables; cases (unsafe abortion) and controls (unintended term pregnancy) as the dependent variable
  2. bLR Model 4 (all variables of LR Model 3 plus contraceptive practices)
  3. cLR Model 5 (all variables of LR Model 4 plus an interaction term between contraceptive practices and contraceptive method)
  4. dPrimigravid = Gravid women who have ever had one pregnancy; Non primigravid = Gravid women who have had more than one pregnancy
  5. eNS= Variable was not significant in the regression model