| 20-24 cohort N = 1916 | 40-44 cohort N = 2155 | 60-64 cohort N = 2021 | Total N = 6092 |
---|---|---|---|---|
Classification of BI | Â | Â | Â | Â |
   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 | Â | Â | Â | Â |
   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 | Â | Â | Â | Â |
   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 | Â | Â | Â | Â |
   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 | Â | Â | Â | Â |
   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 |