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Table 4 Calculated number of cases attributable to the off-hours effect per subgroup and in total in the years 2003 through 2007

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

   

Models with only social-biological factors

 

Models with social-biological factors, characteristics of the delivery and obstetric interventions performed

Subgroups

  

Number of infants with adverse perinatal outcome

 

Number of infants with adverse perinatal outcome

 

Referral

Induction/ augementation

Mode of deliverya

Observed

Expected with elimination of off-hours effect

Attributable to off-hours effect

PARa (in %)

Observed

Expected with elimination of off-hours effect

Attributable to off-hours effect

PARa (in %)

Intrapartum and early neonatal mortality

       

Antepartum

No

Spont. / instr.

187

188

−1

−0.4

187

186

1

0.3

Antepartum

No

Emergency CS

88

60

28

32.2

88

60

28

32.3

Antepartum

Yes

All modes

298

237

61

20.5

297

230

67

22.5

Intrapartum

No

Spont. / instr.

112

108

4

3.2

112

109

3

2.5

Intrapartum

No

Emergency CS

53

40

13

25.1

53

43

10

18.2

Intrapartum

Yes

All modes

86

88

−2

−2.9

86

91

−5

−6.2

Total

  

824

721

103

12.5

823

720

103

12.5

Apgar score 0-6

         

Antepartum

No

All modes

1525

1466

59

3.9

1520

1432

88

5.8

Antepartum

Yes

Spontaneous

1030

844

186

18.0

1027

888

139

13.5

Antepartum

Yes

Instrumental

698

569

129

18.5

697

573

124

17.8

Antepartum

Yes

Emergency CS

776

734

42

5.4

776

717

59

7.6

Intrapartum

No

Spont. / instr.

688

689

−1

−0.1

688

684

4

0.5

Intrapartum

No

Emergency CS

249

210

39

15.7

249

216

33

13.4

Intrapartum

Yes

All modes

791

698

93

11.8

790

721

69

8.8

Total

  

5757

5209

548

9.5

5747

5230

517

9.0

Adverse perinatal outcome (composite measure)

       

Antepartum

No

All modes

5919

5892

27

0.4

5903

5844

59

1.0

Antepartum

Yes

Spontaneous

3078

2746

332

10.8

3065

2783

282

9.2

Antepartum

Yes

Instrumental

1394

1251

143

10.3

1387

1264

123

8.9

Antepartum

Yes

Emergency CS

1553

1519

34

2.2

1553

1508

45

2.9

Intrapartum

No

Spont. / instr.

1762

1733

29

1.7

1757

1712

45

2.6

Intrapartum

No

Emergency CS

420

383

37

8.8

420

395

25

5.9

Intrapartum

Yes

All modes

1465

1362

103

7.0

1464

1414

50

3.4

Total

  

15591

14887

704

4.5

15549

14919

630

4.0

  1. a abbreviations: spont. = spontaneous, intr. = instrumental, CS = caesarean section, PAR = population attributable risk.