Table 2 Qualified risk factors for preterm birth in the multiple logistic regression model
Variables | β | P | OR | 95% CI |
|---|---|---|---|---|
Parity | ||||
≤1 (reference) | ||||
2 | 1.070 | < 0.0001 | 2.92 | 1.71–4.96 |
≥ 3 | 2.112 | 0.001 | 8.26 | 2.29–29.76 |
Interpregnancy interval | ||||
13 to < 24 months (reference) | ||||
0 to < 12 months | 1.674 | 0.003 | 5.33 | 1.79–15.91 |
25 to < 60 months | 0.590 | 0.068 | 1.80 | 0.96–3.40 |
≥ 60 months | 0.467 | 0.140 | 1.60 | 0.86–2.97 |
Hypertension in pregnancy | ||||
No (reference) | ||||
Yes | 2.253 | < 0.0001 | 9.52 | 6.46–14.03 |
Placenta previa | ||||
No (reference) | ||||
Yes | 1.438 | < 0.0001 | 4.21 | 2.85–6.22 |
Height | −0.049 | 0.003 | 0.95 | 0.92–0.98 |
number of vaginal bleeding | 0.593 | < 0.0001 | 1.81 | 1.36–2.41 |