Table 9 Sensitivity analysis including stillbirths: Crude odds ratios and 95 % confidence intervals (CI) expressing the association between early antepartum characteristics and respiratory distress syndrome (RDS), United States, 2005–2006
Unadjusted odds ratios [95 % CI] | |||||
|---|---|---|---|---|---|
RDS < 32 weeks | RDS 32–36 weeks | RDS 37–38 weeks | RDS ≥39 weeks | ||
Maternal age | <20 years | 1.38 [1.29, 1.48] | 1.00 [0.94, 1.06] | 0.83 [0.74, 0.92] | 1.25 [1.14, 1.37] |
20–34 | Reference | Reference | Reference | Reference | |
≥35 | 1.06 [1.04, 1.08] | 1.03 [1.01, 1.04] | 0.97 [0.95, 1.00] | 0.95 [0.92, 0.98] | |
Multifetal gestation | 11.6 [11.1, 12.2] | 9.60 [9.20, 10.0] | 3.63 [3.16, 4.17] | 3.60 [2.65, 4.91] | |
Smoking | 1.48 [1.38, 1.58] | 1.37 [1.30, 1.44] | 1.55 [1.42, 1.68] | 1.49 [1.36, 1.62] | |
Diabetes | 1.63 [1.48, 1.79] | 2.35 [2.20, 2.51] | 2.95 [2.66, 3.26] | 1.76 [1.53, 2.02] | |
Chronic hypertension | 4.57 [4.10, 5.08] | 3.51 [3.18, 3.87] | 3.35 [2.81, 4.00] | 1.78 [1.34, 2.36] | |
Any congenital anomaly | 10.3 [9.61, 11.0] | 5.20 [4.84, 5.58] | 6.67 [5.97, 7.45] | 7.55 [6.78, 8.42] | |
Male sex | 1.11 [1.06, 1.16] | 1.42 [1.37, 1.47] | 1.70 [1.59, 1.81] | 1.48 [1.39, 1.57] | |