Risk factors | RDS <32 weeks | RDS ≥39 weeks | |||||||
---|---|---|---|---|---|---|---|---|---|
Cases | Fetuses at risk | Rate/1000a | Odds ratiosb [95 % CI] | Casess | Fetuses at risk | Rate/1000a | Odds ratiosb [95 % CI] | ||
Age | <20 years | 959 | 434,604 | 2.2 | 1.38 [1.29, 1.48] | 545 | 272,042 | 2.0 | 1.25 [1.14, 1.37] |
20–34 | 5314 | 3,312,305 | 1.6 | Reference | 3249 | 2,024,271 | 1.6 | Reference | |
≥35 | 1177 | 621,356 | 1.9 | 1.06 [1.04, 1.08] | 493 | 354,606 | 1.4 | 0.95 [0.92, 0.98] | |
Multi-fetal gestation | 2169 | 150,761 | 14.4 | 11.6 [11.1, 12.2] | 41 | 7103 | 5.8 | 3.61 [2.65, 4.91] | |
Smoking | 1081 | 450,149 | 2.4 | 1.48 [1.39, 1.58] | 582 | 253,288 | 2.3 | 1.49 [1.36, 1.62] | |
Diabetes | 445 | 163,802 | 2.7 | 1.63 [1.48, 1.80] | 207 | 74,377 | 2.8 | 1.76 [1.53, 2.02] | |
Chronic hypertension | 355 | 47,353 | 7.5 | 4.60 [4.13, 5.12] | 49 | 17,144 | 2.9 | 1.78 [1.34, 2.36] | |
Congenital anomaly | 1000 | 64,417 | 15.5 | 10.5 [9.83, 11.2] | 358 | 31,777 | 11.3 | 7.59 [6.81, 8.46] | |
Male sex | 4004 | 2,235,753 | 1.8 | 1.11 [1.06, 1.16] | 2581 | 1,340,148 | 1.9 | 1.48 [1.39, 1.57] | |
All | 7450 | 4,368,265 | 1.7 | - | 4287 | 2,650,919 | 1.6 | - |