TABLE 3

Univariate and Adjusted HRsa for Emergency Respiratory Hospital Admissions up to Age 5 According to Pregnancy and Birth Characteristics (HR and 95% CI, N = 318 613)

UnivariateAdjusted
HR95% CIHR95% CI
Gestation category (wk)
 <332.822.68–2.962.182.06–2.30
 33–341.891.79–2.001.591.50–1.68
 35–361.541.48–1.601.391.34–1.45
 371.381.33–1.431.321.28–1.37
 381.221.19–1.251.191.16–1.22
 391.121.09–1.141.101.08–1.13
 40–4211
Small for gestational age1.131.10–1.161.071.04–1.10
Maternal age (y)
 <201.241.21–1.281.231.19–1.27
 20–241.161.13–1.191.141.11–1.17
 25–2911
 30–340.890.87–0.910.900.88–0.92
 35–390.850.82–0.870.840.82–0.87
 ≥400.830.78–0.880.800.76–0.85
Parity
 ≥11.010.98–1.031.091.07–1.11
Quintile of social deprivation
 1 (least deprived)11
 21.010.98–1.040.980.95–1.01
 31.131.10–1.161.051.02–1.08
 41.191.15–1.221.081.05–1.11
 5 (most deprived)1.301.26–1.331.111.08–1.14
Gender
 Female0.750.74–0.770.770.75–0.80
Breastfeeding0.810.80–0.830.890.88–0.91
Multiple birth1.191.14–1.250.830.79–0.87
Smoking1.181.15–1.211.041.01–1.06
Neonatal admission1.591.55–1.621.271.24–1.31
Apgar score at 5 min ≤31.251.04–1.491.040.88–1.23
Apgar score at 5 min 4–61.331.21–1.451.010.91–1.11
Major congenital anomaly1.891.83–1.951.661.61–1.72
Minor congenital anomaly1.371.30–1.431.241.18–1.30
Caesarean delivery1.161.14–1.181.101.08–1.12
Season of birth
 January–March11
 April–June1.041.02–1.071.051.03–1.08
 July–September1.181.15–1.211.191.17–1.22
 October–December1.211.19–1.241.221.19–1.25
  • a Adjusted for all variables shown in the model.