Risk factors | RDS 32–36 weeks | RDS 37–38 weeks | |||||||
---|---|---|---|---|---|---|---|---|---|
Cases | Fetuses at risk | Rate/1000a | Odds ratiosb [95 % CI] | Cases | Fetuses at risk | Rate/1000a | Odds ratiosb [95 % CI] | ||
Age | <20 years | 1165 | 426,327 | 2.7 | 1.00 [0.94, 1.06] | 360 | 386,323 | 0.93 | 0.83 [0.74, 0.92] |
20–34 | 8969 | 3,265,775 | 2.7 | Reference | 3364 | 2,978,793 | 1.13 | Reference | |
≥35 | 1808 | 610,342 | 3.0 | 1.03 [1.01, 1.04] | 568 | 545,748 | 1.04 | 0.97 [0.95, 1.00] | |
Multi-fetal gestation | 2770 | 133,526 | 20.7 | 9.61 [9.21, 10.0] | 214 | 55,869 | 3.83 | 3.63 [3.16, 4.17] | |
Smoking | 1613 | 441,604 | 3.7 | 1.37 [1.30, 1.44] | 632 | 392,595 | 1.61 | 1.55 [1.42, 1.69] | |
Diabetes mellitus | 996 | 160,801 | 6.2 | 2.35 [2.20, 2.51] | 414 | 136,882 | 3.02 | 2.95 [2.67, 3.27] | |
Chronic hypertension | 423 | 44,759 | 9.5 | 3.52 [3.19, 3.88] | 126 | 35,036 | 3.60 | 3.35 [2.81, 4.01] | |
Congenital anomaly | 832 | 61,034 | 13.6 | 5.26 [4.90, 5.65] | 346 | 50,707 | 6.82 | 6.71 [6.01, 7.50] | |
Male sex | 7130 | 2,200,877 | 3.2 | 1.42 [1.37, 1.47] | 2739 | 1,994,128 | 1.37 | 1.70 [1.59, 1.81] | |
All | 11,942 | 4,302,444 | 2.8 | - | 4292 | 3,910,864 | 1.10 | - |