Table 3 Rates respiratory distress syndrome (RDS) at early (<32 weeks) and late (≥39 weeks) gestation per 1000 live births and unadjusted odds ratios and 95 % confidence intervals (CI) expressing the association between pregnancy complications and obstetric interventions, and RDS, United States, 2005–2006

 Placental abruption

836

176

1.76 [1.63, 1.90]

60

10

6.33 [4.90, 8.18]

 Placenta previa

199

153.2

1.43 [1.23, 1.67]

25

7.2

4.51 [3.04, 6.69]

 Hypertension in pregnancy

1007

154.3

1.50 [1.39, 1.61]

230

3.6

2.31 [2.02, 2.63]

 Eclampsia

287

174

1.68 [1.47, 1.91]

27

6.9

4.33 [2.96, 6.33]

 Premature rupture of membranes

1510

141.9

1.37 [1.29, 1.46]

107

4.2

2.65 [2.19, 3.21]

 Labour induction

280

90.9

0.78 [0.68, 0.88]

1225

1.8

1.17 [1.09, 1.25]

 Cesarean delivery

5146

121.9

1.28 [1.22, 1.35]

1881

2.8

2.27 [2.13, 2.41]

 Labour induction^a

115

65.8

0.70 [0.58, 0.85]

947

1.6

1.18 [1.09, 1.27]

 Cesarean delivery^a

2503

94.0

1.12 [1.05, 1.19]

1429

2.3

2.16 [2.02, 2.31]

All live births

7450

113.2

-

4287

1.6

-