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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