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Table 3 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

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)

  1. 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.
  2. *significant association (< 0.05) after using the Holm correction method for adjusting for multiple comparisons.
  3. abirth weight + congenital anomalies + foetal head position + administration of analgesics or anaesthetics + parity.
  4. bbirth weight + congenital anomalies + foetal head position + administration of analgesics or anaesthetics + gestational age at delivery.
  5. c(b) + sex + ethnicity of the mother + hospital type + mode of delivery (spontaneous, instrumental, emergency section).
  6. 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.
  7. e(c) + year of birth.
  8. f(d) + single/multiple pregnancies.
  9. g(f) + duration of the second stage of labour.
  10. h(f) + mode of delivery (spontaneous, instrumental, emergency section).
  11. i(g) + mode of delivery (spontaneous, instrumental, emergency section).
  12. jbirth weight + single/multiple pregnancies + hospital type.
  13. k(d) + ethnicity of the mother + mode of delivery (spontaneous, instrumental, emergency section).
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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