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Table 2 Association between congenital heart disease and length of hospital stay after delivery given by relative ratio (RR) and 95% confidence interval (95% CI). Denmark, 1997–2014

From: Length of hospital stay after delivery among Danish women with congenital heart disease: a register-based cohort study

   Number of days of admission after delivery Unadjusted Adjustedb
na Mean (SD) Median (IQR) RR 95% CI p-value RR 95% CI p-value
Maternal congenital heart disease       < 0.001    < 0.001
 No 935,959 3.6 (3.7) 3 (1–4) 1 (ref)   1 (ref)  
 Simple 2242 3.9 (4.4) 3 (2–5) 1.10 1.05–1.16   1.12 1.07–1.18  
 Moderate 1093 4.0 (3.8) 3 (2–5) 1.13 1.06–1.20   1.14 1.07–1.21  
 Complex 384 5.1 (6.7) 4 (2–5) 1.42 1.22–1.66   1.45 1.24–1.70  
  1. aNumber of births in the unadjusted analysis
  2. bAdjusted for maternal age, year of delivery, parity, ethnicity, and maternal educational level