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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.
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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