Table 1 Characteristics of those not reporting a head injury at wave one
| Â | Â | 20-24 cohort N = 1916 | 40-44 cohort N = 2156 | 60-64 cohort N = 2021 | p value |
|---|---|---|---|---|---|
Age (years) | mean (SD) | 22.6 (1.5) | 42.6 (1.5) | 62.5(1.5) | Not tested |
Gender (female) | n (%) | 1050 (54.8) | 1186 (55.0) | 1013 (50.1) | .002 |
Years of education | mean (SD) | 14.3 (1.5) | 14.5 (2.3) | 13.9 (2.6) | <.001 |
Marital status | Â | Â | Â | Â | Â |
| Â | married/de facto n (%) | 467 (24.5) | 1714 (79.5) | 1593 (78.9) | <.001 |
| Â | separated/divorced/widowed n (%) | 23 (1.2) | 272 (12.6) | 376 (18.6) | Â |
| Â | never married n (%) | 1413 (74.3) | 169 (7.8) | 50 (2.5) | Â |
Smoking status | Â | Â | Â | Â | Â |
| Â | never smoked n (%) | 1124 (59.2) | 1132 (52.5) | 1100 (54.5) | <.001 |
| Â | past smoker n (%) | 216 (11.4) | 651 (30.2) | 734 (36.4) | Â |
| Â | current smoker n (%) | 560 (29.5) | 372 (17.3) | 185 (9.2) | Â |
Alcohol classification | Â | Â | Â | Â | Â |
| Â | light/niln (%) | 1782 (93.9) | 2014 (93.6) | 1906 (94.5) | .786 |
| Â | hazardous n (%) | 95 (5.0) | 110 (5.1) | 89 (4.4) | Â |
| Â | harmful n (%) | 21 (1.1) | 27 (1.3) | 21 (1.0) | Â |
Problem marijuana usea | n (%) | 229 (12.0) | 56 (2.6) | 2 (0.1) | <.001 |
Depression medication yes: no | n (%) | 86 (4.5): | 144 (6.7): | 96 (4.8): | .003 |
| Â | n (%) | 1815 (95.5) | 2011 (93.3) | 1923 (95.2) | Â |
Anxiety medication yes: no | n (%) | 114 (6.0): | 155 (7.2): | 87 (4.3): | <.001 |
| Â | n (%) | 1787 (94.0) | 2000 (92.8) | 1932 (95.7) | Â |
Pain medication yes: no | n (%) | 1283 (67.5): | 1473 (68.4): | 1099 (54.4): | <.001 |
| Â | n (%) | 618 (32.5) | 682 (31.6) | 920 (45.6) | Â |
Memory medication yes: no | n (%) | 32 (1.7): | 52 (2.4): | 57 (2.8): | .057 |
| Â | n (%) | 1869 (98.3) | 2103 (97.6) | 1962 (97.2) | Â |
Sleep medication yes: no | n (%) | 183 (9.6): | 284 (13.2): | 249 (12.3): | .001 |
| Â | n (%) | 1718 (90.4) | 1871 (86.8) | 1770 (87.7) | Â |