Descriptive analyses predicting membership classification: TBI former (lifetime but not past 12 months; no current hazardous drinking), TBI recent (past 12 months; no current hazardous drinking), hazardous drinking (never had TBI), former TBI with co-occurring hazardous drinking (no recent TBI), recent TBI with co-occurring hazardous drinking and base category (no TBI or hazardous drinking) by demographics, among adolescents in grades 9–12, Ontario, Canada, 2013, n=3130
| Base category % (95% CI) OR (95% CI) n=2082 | Former TBI (no hazardous drinking) % (95% CI) OR (95% CI) n=367 | Recent TBI (no hazardous drinking) % (95% CI) OR (95% CI) n=104 | Hazardous drinking (no TBI) % (95% CI) OR (95% CI) n=390 | Former TBI and hazardous drinking % (95% CI) OR (95% CI) n=117 | Recent TBI and hazardous drinking % (95% CI) OR (95% CI) n=70 | |
|---|---|---|---|---|---|---|
| Sex | F(5,94)=1.08 | |||||
| Male | 62.0 (57.4 to 66.5) | 12.6 (10.0 to 15.8) | 4.4 (3.0 to 6.6) | 13.5 (11.6 to 15.7) | 5.1 (3.1 to 8.4) | 2.3 (1.4 to 3.8) |
| 1.00 (Ref.) | 1.23 (0.85 to 1.78) | 1.31 (0.67 to 2.53) | 1.03 (0.78 to 1.37) | 1.79 (0.93 to 3.44) | 1.16 (0.57 to 2.32) | |
| n=864 | n=187 | n=51 | n=155 | n=60 | n=34 | |
| Female (Ref.) | 66.3 (62.5 to 69.8) | 11.0 (8.8 to 13.6) | 3.6 (2.2 to 6.0) | 13.9 (11.7 to 16.6) | 3.1 (2.1 to 4.4) | 2.1 (1.4 to 3.1) |
| n=1218 | n=180 | n=53 | n=235 | n=57 | n=36 | |
| Grade | F(15,84)=14.37*** | |||||
| 12 | 72.1 (68.6 to 75.3) | 14.8 (11.8 to 18.4) | 6.5 (4.4 to 9.5) | 4.8 (3.2 to 7.1) | 0.8 (0.3 to 1.9) | 1.1 (0.5 to 2.5) |
| 1.00 (Ref.) | 0.84 (0.52 to 1.34) | 0.84 (0.39 to 1.79) | 6.35 (4.16 to 9.69)*** | 11.75 (4.03 to 34.27)*** | 3.07 (1.16 to 8.15)** | |
| n=458 | n=60 | n=22 | n=162 | n=46 | n=24 | |
| 11 | 71.1 (65.9 to 75.7) | 13.3 (10.0 to 17.4) | 2.4 (1.2 to 4.8) | 8.0 (4.9 to 12.8) | 2.5 (1.3 to 4.9) | 2.8 (1.4 to 5.5) |
| 1.00 (Ref.) | 0.85 (0.55 to 1.30) | 0.58 (0.32 to 1.04) | 3.58 (1.98 to 6.46)*** | 7.88 (2.96 to 20.95)*** | 2.47 (0.74 to 8.24) | |
| n=518 | n=88 | n=22 | n=125 | n=35 | n=21 | |
| 10 | 63.2 (57.4 to 68.6) | 11.0 (8.2 to 14.5) | 3.3 (1.9 to 5.7) | 15 (11.1 to 19.9) | 5.3 (3.7 to 7.4) | 2.4 (1.0 to 5.6) |
| 1.00 (Ref.) | 0.91 (0.65 to 1.28) | 0.37 (0.18 to 0.78) | 1.69 (0.87 to 3.39) | 3.37 (1.06 to 10.76)* | 2.57 (0.84 to 7.89) | |
| n=548 | n=110 | n=24 | n=63 | n=22 | n=14 | |
| 9 (Ref.) | 54.4 (48.9 to 59.7) | 9.4 (6.9 to 12.6) | 4.1 (2.2 to 7.6) | 22.9 (19.6 to 26.5) | 6.7 (4.2 to 10.7) | 2.5 (1.6 to 3.8) |
| n=558 | n=109 | n=36 | n=40 | n=14 | n=11 | |
TBI, traumatic brain injury.
* P < 0.05; ** P < 0.01; *** P < 0.001.