Table 4 Hazard of TBI by birth order and sex in Finland, 1987–2005.

From: Birth order and pediatric traumatic brain injury

 

First time diagnosed TBI 1987–1992

Male (n = 141)

Female (n = 123)

Birth order

HR

95% CI

HR

95% CI

First

1.00

–

1.00

–

Second

1.83

1.21–2.76

1.17

0.75–1.82

Third

1.86

1.09–3.17

1.29

0.74–2.25

Fourth or higher

2.44

1.27–4.67

2.02

1.07–3.83

 

First time diagnosed TBI 1993–1998

Male (n = 282)

Female (n = 182)

Birth order

HR

95% CI

HR

95% CI

First

1.00

–

1.00

–

Second

1.52

1.14–2.02

0.84

0.59–1.20

Third

1.45

0.99–2.13

1.14

0.73–1.78

Fourth or higher

1.94

1.23–3.07

1.45

0.82–2.58

 

First time diagnosed TBI 1999–2005

Male (n = 561)

Female (n = 325)

Birth order

HR

95% CI

HR

95% CI

First

1.00

–

1.00

–

Second

0.98

0.80–1.19

1.05

0.81–1.37

Third

1.31

1.02–1.68

1.16

0.82–1.64

Fourth or higher

1.36

0.97–1.91

1.50

0.97–2.31

 

First time diagnosed TBI 1987–2005

Male (n = 984)

Female (n = 630)

Birth order

HR

95% CI

HR

95% CI

First

1.00

–

1.00

–

Second

1.21

1.04–1.41

0.97

0.80–1.18

Third

1.41

1.16–1.71

1.17

0.91–1.50

Fourth or higher

1.63

1.27–2.09

1.53

1.13–2.07

  1. Both sexes are adjusted for the joint effect of sex and birth order, as well as the main effects of sex and maternal age at child’s birth.
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