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Table 2 Risk factors of unsafe abortion in relation to their family formation characteristics among women with unintended pregnancies

From: Relationship of family formation characteristics with unsafe abortion: is it confounded by women’s socio-economic status? - A case–control study from Sri Lanka

Family formation characteristics

Cases

Controls

Crude OR (95 % CI)

Adjusted OR (95 % CI)b

N = 171a

N = 600a

No.

%

No.

%

Current marital status

      

 Single/divorce/separate/widow

31

18.1 %

10

1.7 %

12.9 (6.3–27)

9.3 (4.0–21.6)

 Married (Reference)

140

81.9 %

589

98.3 %

1.00

1.00

Fertility behaviour

      

 No decision on family size

89

52.0 %

173

28.8 %

2.5 (1.9–3.8)

2.2 (1.4–3.5)

 Decision made:

      

  Family completed

41

24.0 %

230

38.3 %

0.9 (0.5–1.4)

1.0 (0.6–1.6)

  Family not completed (Reference)

41

24.0 %

197

32.8 %

1.00

1.00

Ever used contraceptives

      

 No

37

21.6 %

96

16.0 %

1.5 (0.9–2.2)

-

 Yes (Reference)

134

78.4 %

504

84.0 %

1.00

 

Gravida

      

 Primigravid

36

21.1 %

83

13.8 %

1.7 (1.1–2.6)

2.2 (1.2–4.2)

 Non-primigravid (Reference)

135

78.9 %

517

86.2 %

1.00

1.00

At least one male child

      

 No

65

38.0 %

221

36.8 %

1.0 (0.7–1.5)

-

 Yes (Reference)

106

62.0 %

379

63.2 %

1.00

 

At least one female child

      

 No

90

52.6 %

210

35.0 %

2.1 (1.5–2.9)

2.2 (1.4–3.4)

 Yes (Reference)

81

47.4 %

390

65.0 %

1.00

1.00

Having disabled children

      

 Yes

6

3.5 %

8

1.3 %

2.9 (1.0–8.6)

-

 None (Reference)

165

96.5 %

592

98.7 %

1.00

 

In years

Mean

SD

Mean

SD

Significance

 

Age at last pregnancy

30.6

6.6

30.5

6.3

p = 0.2

-

Marriage - P1 intervalc

1.1

0.7

1.6

2.1

p = 0.3

-

Average birth intervald

3.4

1.6

2.9

1.2

p = 0.000

 

Last birth intervald

5.7

4.1

4.8

3.3

p = 0.01

 
  1. aIn some variables, row values do not add up to the total cases and controls due to missing data
  2. bAdjusted OR (odds ratio) obtained from the logistic regression analysis using education level, employment, marital status, being primigravid, informed decision on family size and having a female child as the independent variables; cases (unsafe abortion) and controls (unintended term pregnancy) as dependent variable
  3. cOnly primigravid women included
  4. dOnly non-primigravid women included; average birth interval calculated since first pregnancy