Table 2

Classification, causes and incident rates for head injuries reported at Wave two

20-24 cohort

N = 1916

40-44 cohort

N = 2155

60-64 cohort

N = 2021

Total

N = 6092


Classification of BI

No BI n (%)

1844 (96.2)

2137 (99.1)

2011 (99.5)

5992 (98.4)

{95% CI}

{95.3, 97.1}

{98.6, 99.5}

{99.1, 99.8}

{98.0, 98.7}

Mild BI n (%)

39 (2.0)

11 (0.5)

6 (0.3)

56 (0.9)

{95% CI}

{1.4, 2.8}

{0.3, 0.9}

{0.1, 0.6}

{0.7, 1.2}

Moderate BI n (%)

33 (1.7)

7 (0.3)

4 (0.2)

44 (0.7)

{95% CI}

{1.2, 2.4}

{0.1, 0.7}

{0.05, 0.51}

{0.5, 1.0}

Cause Mild BI

Traffic accident n (%)

2 (5.1)

1 (9.1)

1 (16.7)

4 (7.1)

Sport n (%)

20 (51.3)

2 (18.2)

1 (16.7)

23 (41.1)

Assault n (%)

6 (15.4)

1 (9.1)

0 (0.0)

7 (12.5)

Fall n (%)

7 (17.97)

5 (45.5)

4 (66.7)

16 (28.6)

Other/don't know n (%)

4 (10.3)

2 (18.2)

0 (0.0)

6 (10.7)

Cause moderate BI

Traffic accident n (%)

6 (18.2)

5 (71.4)

1 (25.0)

12 (27.3)

Sport n (%)

17 (51.5)

0 (0.0)

0 (0.0)

17 (38.6)

Assault n (%)

4 (12.1)

0 (0.0)

0 (0.0)

4 (9.1)

Fall n (%)

5 (15.2)

1 (14.3)

3 (75.0)

9 (20.5)

Other/don't know n (%)

1 (3.0)

1 (14.3)

0 (0.0)

2 (4.5)

Incident rate mild BI/100000 p-y

Males

636.9

159.5

122.5

292.1

Females

401.0

108.6

24.3

177.4

Total

506.9

131.5

73.2

230.8

Incident rate moderate BI/100000 p-y

Males

771.3

79.5

73.3

290.3

Females

140.4

86.7

24.3

84.5

Total

424.4

83.4

48.7

180.5


BI = brain injury: p-y = person years, CI = Confidence interval

Tait et al. BMC Public Health 2010 10:171   doi:10.1186/1471-2458-10-171

Open Data