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Table 2 Adjusted odds ratios (95% confidence intervals) for the effect of time of birth by referral status (intrapartum and antepartum) and outcome

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

Subgroups      Odds ratio (95% CI)
      Time of the day (reference group is day) Part of the week (reference group is weekday)
Referral Induction / augmentation Mode of delivery Covariates in model (see notes) Number of infants Evening Night Weekend
Intrapartum and early neonatal mortality     
antepartum no spont. / instr. c 116884 0.86 (0.56-1.33) 0.97 (0.71-1.33) 1.10 (0.81-1.48)
antepartum no emergency CS d 16850 1.15 (0.61-2.17) 1.86 (1.16-2.99) 1.41 (0.92-2.18)
antepartum yes all modes c 174310 1.44 (1.08-1.91) 1.75 (1.32-2.33) * 1.05 (0.81-1.37)
intrapartum no spont. / instr. e 68325 1.17 (0.70-1.96) 1.07 (0.70-1.63) 0.95 (0.64-1.42)
intrapartum no emergency CS f 6806 1.54 (0.73-3.21) 1.70 (0.91-3.18) 1.07 (0.61-1.89)
intrapartum yes all modes f 62913 0.99 (0.58-1.66) 0.84 (0.50-1.44) 1.05 (0.66-1.66)
Apgar score 0-6     
antepartum no all modes b 133797 1.06 (0.92-1.23) 1.02 (0.91-1.15) 1.06 (0.95-1.18)
antepartum yes spontaneous b 116571 1.53 (1.31-1.78) * 1.72 (1.47-2.02) * 0.93 (0.80-1.08)
antepartum yes instrumental b 28913 1.44 (1.20-1.73) * 1.43 (1.19-1.73) * 1.06 (0.89-1.26)
antepartum yes emergency CS b 28602 1.02 (0.86-1.21) 1.19 (0.99-1.43) 1.04 (0.88-1.22)
intrapartum no spont. / instr. b 68320 1.22 (1.00-1.50) 1.06 (0.89-1.26) 0.83 (0.71-0.98)
intrapartum no emergency CS a 6805 1.20 (0.84-1.71) 1.40 (1.04-1.87) 1.08 (0.82-1.42)
intrapartum yes all modes a 62908 1.14 (0.95-1.36) 1.38 (1.17-1.63) * 1.00 (0.86-1.16)
Adverse perinatal outcome (composite measure)     
antepartum no all modes b 133887 1.01 (0.94-1.10) 0.98 (0.92-1.05) 1.03 (0.97-1.10)
antepartum yes spontaneous b 116593 1.26 (1.15-1.39) * 1.51 (1.37-1.66) * 0.95 (0.86-1.04)
antepartum yes instrumental b 28920 1.16 (1.01-1.33) 1.30 (1.13-1.49) * 1.04 (0.92-1.18)
antepartum yes emergency CS b 28638 1.02 (0.90-1.15) 1.03 (0.90-1.18) 1.05 (0.93-1.18)
intrapartum no spont. / instr. b 68325 1.16 (1.01-1.32) 1.01 (0.90-1.12) 0.97 (0.87-1.08)
intrapartum no emergency CS a 6806 0.97 (0.72-1.32) 1.29 (1.02-1.63) 1.06 (0.85-1.33)
intrapartum yes all modes b 62913 1.05 (0.92-1.20) 1.26 (1.11-1.42) * 0.99 (0.89-1.11)
  1. Models fitted with both time of the day and day of the week, and socio-biological factors.
  2. *significant association (< 0.05) after using the Holm correction method for adjusting for multiple comparisons.
  3. abirth weight, gestational age at delivery, congenital anomalies, foetal head position, general medical or obstetric problems of the mother, maternal age, parity, sex, ethnicity of the mother, socioeconomic status, degree of urbanization of the maternal place of residence.
  4. b(a) + single/multiple pregnancies.
  5. cbirth weight, gestational age at delivery, congenital anomalies, foetal head position, ethnicity of the mother, sex.
  6. dbirth weight, single/multiple pregnancies.
  7. ebirth weight, congenital anomalies, foetal head position, parity.
  8. fbirth weight, gestational age at delivery, congenital anomalies, foetal head position.