Odds ratio | 95% Confidence interval | P value | |
---|---|---|---|
Age (years) | |||
≥ 40 | 1.11 | 0.71, 1.75 | 0.65 |
35–39 | 1.13 | 0.80, 1.60 | 0.48 |
30–34 | 1.12 | 0.81, 1.57 | 0.50 |
25–29 | 0.95 | 0.67, 1.35 | 0.78 |
< 20 | 1.08 | 0.55, 2.10 | 0.83 |
20–24 (reference) | 1.00 | ||
BMI (kg/m2) | |||
≥ 30.00 | 1.34 | 0.91, 1.99 | 0.14 |
25.0–29.9 | 0.84 | 0.67, 1.05 | 0.12 |
< 18.5 | 0.97 | 0.67, 1.41 | 0.89 |
18.5–24.9 (reference) | 1.00 | ||
Smoking | |||
Yes | 0.96 | 0.73, 1.28 | 0.79 |
No | 1.00 | ||
Multiple births | |||
Yes | 1.06 | 0.78, 1.43 | 0.72 |
No | 1.00 | ||
PROM | |||
Yes | 2.02 | 1.68, 2.41 | < 0.001 |
No | 1.00 | ||
Placenta previa | |||
Yes | 0.89 | 0.58, 1.35 | 0.57 |
No | 1.00 | ||
HDP | |||
Yes | 0.97 | 0.57, 1.67 | 0.92 |
No | 1.00 | ||
GDM | |||
Yes | 0.74 | 0.45, 1.22 | 0.23 |
No | 1.00 | ||
Gestational age at admission | 0.99 | 0.97, 1.02 | 0.65 |
Duration of ritodrine hydrochloride | |||
≤ 48 h (reference) | 1.00 | ||
3–6 days | 2.52 | 2.05, 3.10 | < 0.001 |
7–13 days | 0.66 | 0.49, 0.89 | < 0.001 |
14–27 days | 0.38 | 0.27, 0.53 | < 0.001 |
≥ 28 days | 0.37 | 0.26, 0.52 | < 0.001 |