| |
Incidence Rate Ratio
|
95 % Confidence Interval
|
|---|
|
Mode of delivery
|
|
C-section vs. vaginal
|
|
22–27 weeks
|
0.63
|
0.58–0.70
|
|
28–31 weeks
|
0.89
|
0.82–0.96
|
|
32–36 weeks
|
1.11
|
1.05–1.17
|
|
37–41 weeks
|
1.35
|
1.30–1.40
|
|
≥ 42 weeks
|
1.20
|
0.85–1.69
|
|
Any GA vs. GA 37–41 weeks
|
|
22–27 vs. 37–41 weeks
|
|
- Vaginal delivery
|
101.41
|
94.51–108.83
|
|
- Cesarean section
|
64.34
|
59.31–69.81
|
|
28–31 vs. 37–41 weeks
|
|
- Vaginal delivery
|
28.02
|
26.08–30.12
|
|
- Cesarean section
|
24.87
|
23.35–26.49
|
|
32–36 vs. 37–41 weeks
|
|
- Vaginal delivery
|
5.43
|
5.15–5.73
|
|
- Cesarean section
|
6.02
|
5.73–6.31
|
|
≥ 42 vs. 37–41 weeks
|
|
- Vaginal delivery
|
1.34
|
1.04–1.74
|
|
- Cesarean section
|
1.61
|
1.28–2.03
|
- Adjusted for year of birth, maternal age, marital status, years of study, multiple gestation, parity, prenatal care, neonatal sex, 1st minute Apgar score and congenital malformations
