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Table 1 Distribution of infants by time of referral and time of birth, and the occurrence of the adverse perinatal outcomes

From: Effects of hospital delivery during off-hours on perinatal outcome in several subgroups: a retrospective cohort study

  Births, n (%) Intrapartum and early neonatal mortality (%) Apgar score 0–6 (%) Composite outcome (%)
Referred to a hospital antepartum (n =310776)
Office hours 123689 (39.8) 0.14* 1.08* 3.24*
Off-hours 187087 (60.2) 0.21 1.46 4.32
Weekdays 224380 (72.2) 0.18* 1.28* 3.73*
Weekends 86396 (27.8) 0.21 1.39 4.32
Day 158496 (51.0) 0.15* 1.10* 3.37*
Evening 64952 (20.9) 0.20 1.58 4.21
Night 87328 (28.1) 0.24 1.49 4.61
Referred to a hospital intrapartum (n =138938)
Office hours 46266 (33.3) 0.17 1.15* 2.41*
Off-hours 92672 (66.7) 0.19 1.31 2.76
Weekdays 92255 (66.4) 0.18 1.26 2.59
Weekends 46683 (33.6) 0.19 1.24 2.75
Day 65023 (46.8) 0.17 1.12* 2.45*
Evening 28760 (20.7) 0.20 1.34 2.70
Night 45155 (32.5) 0.19 1.39 2.90
  1. * p value for testing differences between time of birth groups with χ2-tests < 0.05.
  2. Composite outcome consists of intrapartum and early neonatal mortality, Apgar score of 0–6, severe birth trauma, and admission to an neonatal intensive care unit.