Table 2 Participant characteristics
From: Development and external validation of a new PTA assessment scale
2a. Derviation cohort | |||
|---|---|---|---|
|  |  Mild TBI  |  Moderate/severe TBI  |  Control subjects  |
n | 105 | 21 | 31 |
Gender (male), n (%) | 64 (61) | 18 (86) | 12 (39) |
Age, mean (sd) | 46.6 (20.4) | 30.1 (16.9) | 52.6 (14.2) |
Educational level, n (%) a | Â | Â | Â |
 - Low | 31 (30) | 8 (38) | 11 (35) |
 - Intermediate | 22 (21) | 6 (29) | 6 (19) |
 - High | 24 (23) | 1 (5) | 9 (29) |
 - missing | 28 (27) | 6 (29) | 5 (16) |
Injury mechanism, n (%) | Â | Â | Â |
 - traffic related | 54 (51) | 12 (57) | 3 (30) |
 - fall | 29 (28) | 3 (14) | 7 (70) |
 - violence | - | - | - |
 - other | 22 (21) | 6 (29) | - |
2b. Validation cohort | |||
n | 117 | 15 | 30 |
Gender (male), n (%) | 76 (65) | 10 (67) | 17 (57) |
Age, mean (sd) | 50.7 (22.3) | 39.7 (19.6) | 41.4 (18.7) |
Educational level, n (%) a | Â | Â | Â |
 - Low | 28 (24) | 1 (7) | 8 (27) |
 - Intermediate | 34 (29) | 7 (47) | 10 (33) |
 - High | 36 (31) | 2 (13) | 12 (40) |
 - missing | 19 (16) | 5 (33) | - |
Years of education, mean (sd) | 13.7 (4.3) | 13.3 (3.4) | 15.3 (4.8) |
Injury mechanism, n (%) | Â | Â | Â |
 - traffic related | 47 (40) | 9 (60) | 1 (10) |
 - fall | 52 (44) | 3 (20) | 3 (30) |
 - violence | 6 (5) | - | - |
 - other | 9 (8) | 3 (20) | 6 (60) |
 - missing | 3 (3) | - | - |