Table 3.
The influence of prior IA on risk of PTB or LBW.
| History of IA | PTB | LBW | ||||||
|---|---|---|---|---|---|---|---|---|
| No | Yes | OR (95% CI) | AOR* (95% CI) | No | Yes | OR (95% CI) | AOR* (95% CI) | |
| 0 | 2628 (91.41) | 247 (8.59) | 1.00 | 1.00 | 2625 (91.30) | 250 (8.70) | 1.00 | 1.00 |
| 1 | 541 (92.01) | 47 (7.99) | 0.92 (0.67–1.28) | 0.77 (0.50–1.17) | 547 (93.03) | 41 (6.97) | 0.79 (0.56–1.11) | 0.83 (0.54–1.27) |
| ≧2 | 192 (86.88) | 29 (13.12) | 1.61 (1.07–2.43) | 1.09 (0.53–2.22) | 194 (87.78) | 27 (12.22) | 1.46 (0.96–2.23) | 1.73 (0.77–3.86) |
Abbreviations: OR, odds ratio; CI, confidence interval; AOR, adjusted odds ratio; PTB, preterm birth; LBW, low birth weight; IA, induced abortion.
*Adjusted OR and 95% CI were calculated by the logistic regression model after adjusting for age, health insurance, occupation, gravidity and education.