Table 1. Demographic and Baseline Clinical Characteristics by Head Computed Tomography (CT) Status (n = 1935) in the Transforming Research and Clinical Knowledge in Traumatic Brain Injury Study.
| Characteristic | Total, No. (%) | Initial head CT with findings of acute intracranial abnormality, No. (%) | P value | |
|---|---|---|---|---|
| Negative | Positive | |||
| Sex | ||||
| Male | 1286 (66.5) | 782 (60.8) | 504 (39.2) | .004 |
| Female | 649 (33.5) | 438 (67.5) | 211 (32.5) | |
| Total | 1935 (100.0) | 1220 (63.0) | 715 (37.0) | |
| Race | ||||
| White | 1481 (77.5) | 893 (60.3) | 588 (39.7) | <.001 |
| Black | 318 (16.6) | 244 (76.7) | 74 (23.3) | |
| Other | 113 (5.9) | 71 (62.8) | 42 (37.2) | |
| Total | 1912 (100.0) | 1208 (63.2) | 704 (36.8) | |
| Hispanic ethnicity | ||||
| No | 1526 (79.8) | 969 (63.5) | 557 (36.5) | .68 |
| Yes | 387 (20.2) | 241 (62.3) | 146 (37.7) | |
| Total | 1913 (100.0) | 1210 (63.3) | 703 (36.7) | |
| Neuropsychiatric history | ||||
| No | 1501 (77.7) | 935 (62.3) | 566 (37.7) | .24 |
| Yes | 432 (22.3) | 283 (65.5) | 149 (34.5) | |
| Total | 1933 (100.0) | 1218 (63.0) | 715 (37.0) | |
| Prior traumatic brain injury | ||||
| Yes | 586 (31.5) | 409 (69.8) | 177 (30.2) | <.001 |
| No | 1272 (68.5) | 768 (60.4) | 504 (39.6) | |
| Total | 1858 (100.0) | 1177 (63.3) | 681 (36.7) | |
| Care pathway | ||||
| Emergency department discharge | 503 (26.0) | 453 (90.1) | 50 (9.9) | <.001 |
| Hospital admission without intensive care | 833 (43.0) | 584 (70.1) | 249 (29.9) | |
| Hospital admission with intensive care | 599 (31.0) | 183 (30.6) | 416 (69.4) | |
| Total | 1935 (100.0) | 1220 (63.0) | 715 (37.0) | |
| Age, y | ||||
| Mean (SD) | 41.5 (17.6) | 37.7 (15.8) | 47.8 (18.7) | <.001 |
| Median (IQR) [range] | 38 (26-55) [17-90] | 34 (24-50) [17-88] | 48 (31-64) [17-90] | |
| Education, y | ||||
| Mean (SD) | 13.5 (2.9) | 13.4 (2.7) | 13.6 (3.2) | .046 |
| Median (IQR) [range] | 13 (12-16) [0-20] | 12 (12-16) [1-20] | 13 (12-16) [0-20] | |
Abbreviation: IQR, interquartile range.