Table 3

Adjusted odds ratios (95% confidence intervals) for the effect of time of birth by referral status (intrapartum and antepartum) and outcome
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 Model covariates (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) 0.99 (0.72-1.35) 1.10 (0.81-1.49)
Antepartum No Emergency CS j 16850 1.14 (0.60-2.16) 1.84 (1.14-2.96) 1.41 (0.92-2.17)
Antepartum Yes All modes e 174151 1.43 (1.07-1.90) 1.78 (1.35-2.40) * 1.08 (0.82-1.41)
Intrapartum No Spont. / instr. a 68325 1.16 (0.69-1.93) 1.05 (0.69-1.61) 0.95 (0.63-1.42)
Intrapartum No Emergency CS b 6806 1.47 (0.69-3.12) 1.48 (0.78-2.83) 1.05 (0.58-1.89)
Intrapartum Yes All modes b 62913 0.90 (0.53-1.53) 0.79 (0.46-1.35) 1.06 (0.67-1.67)
Apgar score 0-6
Antepartum No All modes f 133650 1.08 (0.93-1.25) 1.08 (0.96-1.21) 1.05 (0.95-1.17)
Antepartum Yes Spontaneous g 116358 1.34 (1.15-1.56) * 1.54 (1.31-1.80) * 0.93 (0.80-1.08)
Antepartum Yes Instrumental g 28848 1.41 (1.17-1.69) * 1.42 (1.17-1.72) * 1.06 (0.89-1.26)
Antepartum Yes Emergency CS f 28602 1.08 (0.90-1.28) 1.17 (0.98-1.42) 1.08 (0.92-1.28)
Intrapartum No Spont. / instr. i 68265 1.23 (1.00-1.50) 1.07 (0.90-1.27) 0.83 (0.71-0.98)
Intrapartum No Emergency CS d 6805 1.18 (0.82-1.70) 1.30 (0.97-1.76) 1.10 (0.83-1.45)
Intrapartum Yes All modes k 62865 1.06 (0.89-1.28) 1.29 (1.09-1.52) 1.00 (0.86-1.17)
Adverse perinatal outcome (composite measure)
Antepartum No All modes f 133734 1.00 (0.92-1.09) 1.00 (0.94-1.07) 1.03 (0.97-1.10)
Antepartum Yes Spontaneous g 116380 1.24 (1.13-1.37) * 1.43 (1.29-1.58) * 0.92 (0.84-1.01)
Antepartum Yes Instrumental g 28855 1.20 (1.04-1.37) 1.24 (1.07-1.42) 1.00 (0.88-1.14)
Antepartum Yes Emergency CS f 28638 1.03 (0.91-1.17) 1.02 (0.89-1.18) 1.07 (0.95-1.21)
Intrapartum No Spont. / instr. i 68270 1.17 (1.02-1.34) 1.02 (0.91-1.14) 0.98 (0.89-1.09)
Intrapartum No Emergency CS d 6806 0.96 (0.70-1.30) 1.21 (0.95-1.54) 1.04 (0.83-1.30)
Intrapartum Yes All modes h 62870 0.96 (0.84-1.11) 1.16 (1.03-1.32) 1.00 (0.89-1.12)

Models fitted with both time of the day and day of the week, and socio-biological factors and characteristics of the delivery and obstetric interventions performed.

*significant association (< 0.05) after using the Holm correction method for adjusting for multiple comparisons.

abirth weight + congenital anomalies + foetal head position + administration of analgesics or anaesthetics + parity.

bbirth weight + congenital anomalies + foetal head position + administration of analgesics or anaesthetics + gestational age at delivery.

c(b) + sex + ethnicity of the mother + hospital type + mode of delivery (spontaneous, instrumental, emergency section).

d(b) + general medical or obstetric problems of the mother + maternal age + parity + sex + socioeconomic status + degree of urbanization of the maternal place of residence + hospital type + year of birth + ethnicity of the mother.

e(c) + year of birth.

f(d) + single/multiple pregnancies.

g(f) + duration of the second stage of labour.

h(f) + mode of delivery (spontaneous, instrumental, emergency section).

i(g) + mode of delivery (spontaneous, instrumental, emergency section).

jbirth weight + single/multiple pregnancies + hospital type.

k(d) + ethnicity of the mother + mode of delivery (spontaneous, instrumental, emergency section).

Gijsen et al.

Gijsen et al. BMC Pregnancy and Childbirth 2012 12:92   doi:10.1186/1471-2393-12-92

Open Data