Table 2.
The association between IA and PTB or LBW in the IA and non-IA groups.
| Variable | Non-IA group (N = 2875) | IA group (N = 809) | OR (95% CI) | P | AOR* (95% CI) | P |
|---|---|---|---|---|---|---|
| PTB | ||||||
| No | 2628 (91.41) | 733 (90.61) | 1.00 | 1.00 | ||
| Yes | 247 (8.59) | 76 (9.39) | 1.10 (0.84–1.44) | 0.476 | 0.80 (0.53–1.20) | 0.282 |
| ≧37 weeks | 2628 (91.41) | 733 (90.61) | 1.00 | 1.00 | ||
| <37 weeks | 198 (6.89) | 62 (7.66) | 1.12 (0.83–1.51) | 0.445 | 0.83 (0.53–1.30) | 0.411 |
| <32 weeks | 42 (1.46) | 12 (1.48) | 1.02 (0.54–1.96) | 0.942 | 0.64 (0.23–1.78) | 0.397 |
| <28 weeks | 7 (0.24) | 2 (0.25) | 1.02 (0.21–4.94) | 0.976 | 0.83 (0.09–7.55) | 0.868 |
| LBW | ||||||
| No | 2625 (91.30) | 741 (91.59) | 1.00 | 1.00 | ||
| Yes | 250 (8.70) | 68 (8.41) | 0.96 (0.73–1.28) | 0.795 | 0.86 (0.57–1.31) | 0.489 |
| ≧2500 grams | 2625 (91.30) | 741 (91.59) | 1.00 | 1.00 | ||
| <2500 grams | 196 (6.82) | 50 (6.18) | 0.90 (0.66–1.25) | 0.537 | 0.89 (0.56–1.43) | 0.633 |
| <1500 grams | 54 (1.88) | 18 (2.22) | 1.18 (0.69–2.03) | 0.546 | 0.77 (0.33–1.80) | 0.547 |
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.