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Table 4 The incidence of risk factors and perinatal mortality risk

From: Decreasing trend in preterm birth and perinatal mortality, do disparities also decline?

Risk factors

 

Perinatal mortality per 1000 births

 

N

Per 1000

Crude Odds

 

Adjusted odds

*1

Adjusted odds

*2

Total

4947

5.0

 

(95% CI)

 

(95% CI)

 

(95% CI)

Year

  

0.96

(0.94–0.97)

0.96

(0.94–0.97)

0.96

(0.95–0.98)

Parity

 P0

45.5%

5.5

1.44

(1.35–1.54)

1.45

(1.36–1.55)

1.09

(1.01–1.17)

 P1

35.7%

3.8

1.00

 

1.00

 

1.00

 

 P2+

18.8%

5.9

1.56

(1.44–1.69)

1.38

(1.28–1.50)

1.35

(1.24–1.47)

Maternal age (years)

  < 20

1.2%

6.5

1.43

(1.14–1.79)

1.11

(0.88–1.39)

1.04

(0.82–1.31)

 20–24

10.0%

5.8

1.27

(1.16–1.39)

1.11

(1.01–1.21)

1.07

(0.97–1.17)

 25–34

68.1%

4.5

1.00

 

1.00

 

1.00

 

 35–39

17.4%

5.3

1.16

(1.08–1.25)

1.18

(1.10–1.28)

1.07

(0.99–1.16)

  > =40

3.3%

9.0

2.00

(1.77–2.25)

1.92

(1.70–2.17)

1.38

(1.21–1.57)

Ethnicity

 Dutch

75.6%

4.4

1.00

 

1.00

 

1.00

 

 Other European

4.8%

4.9

1.12

(0.98–1.28)

1.09

(0.95–1.24)

1.10

(0.96–1.26)

 Mediterranean

7.0%

6.7

1.52

(1.38–1.68)

1.42

(1.29–1.57)

1.39

(1.25–1.55)

 African

2.6%

10.1

2.30

(2.03–2.61)

2.12

(1.87–2.42)

1.50

(1.31–1.72)

 South Asian

1.2%

6.0

1.37

(1.08–1.72)

1.34

(1.06–1.69)

0.76

(0.60–0.97)

 Asian

2.6%

5.3

1.19

(1.01–1.42)

1.17

(0.99–1.39)

1.08

(0.90–1.29)

 other non-Western

6.0%

7.4

1.69

(1.53–1.87)

1.63

(1.47–1.80)

1.47

(1.32–1.63)

Social-Economic status

 Low

24.7%

5.9

1.21

(1.13–1.29)

1.06

(0.99–1.14)

1.00

(0.93–1.08)

 Mid

50.5%

4.9

1.00

 

1.00

 

1.00

 

 High

24.8%

4.2

0.86

(0.80–0.93)

0.86

(0.80–0.92)

0.92

(0.86–0.997)

Intermediate risk factors

 Preterm birth < 37 weeks

6.1%

95.3

53.3

(50.3–56.5)

  

25.8

(24.3–27.4)

 Congenital anomalies

3.1%

83.4

17.2

(16.3–18.1)

  

5.2

(4.8–5.6)

 Small gestational age (SGA) P10

8.8%

38.8

8.68

(8.26–9.12)

  

3.9

(3.7–4.2)

  1. Adjusted for:
  2. *1 Age, parity, ethnicity en SES
  3. *2 = Age, parity, ethnicity, SES, prematurity, congenital anomalies and SGA