Table 2.
Summary statistics of clinical variables included in the analysis.
| Variable category | Variable name | Summary statistics in TTP | Summary statistics in COBRIT |
|---|---|---|---|
| Demographics | *#Age (< 30/30~45/>45) | 155/107/216 | 164/115/285 |
| *#Gender (female/male) | 138/340 | 162/402 | |
| Ethnicity (not Hispanic or Latino/Hispanic or Latino) | 403/75 | 535/29 | |
| *Education (college and grad/before high and high) | 148/330 | 113/451 | |
| *#Employment (employed/unemployed) | 275/203 | 386/178 | |
| *#Marital status (married/not married) | 151/327 | 232/332 | |
| Medical history | *#Alcohol use (no/yes) | 238/240 | 219/345 |
| Prior developmental disease (no/yes) | 424/54 | 503/61 | |
| *Prior psychiatric disease (no/yes) | 330/148 | 445/119 | |
| Current TBI mechanism | Injury mechanism—bike (no/yes) | 398/80 | 505/59 |
| Injury mechanism—pedestrian (no/yes) | 443/35 | 535/29 | |
| Injury mechanism—motorcycle (no/yes) | 465/13 | 477/87 | |
| #Injury mechanism—motor (no/yes) | 391/87 | 419/145 | |
| Injury mechanism−other person (no/yes) | 398/80 | 494/70 | |
| *#Injury mechanism—fall (no/yes) | 325/153 | 417/147 | |
| Injury mechanism—striking (no/yes) | 462/16 | 549/15 | |
| Injury mechanism—other types (no/yes) | 464/14 | 552/12 | |
| ED examination | GCS total score at ED arrival (13/14/15) | 16/99/363 | 60/110/394 |
| GCS assessment condition at ED arrival (no sedation or paralysis/sedation or paralysis) | 473/5 | 535/29 | |
| GCS total score at ED discharge (3–12/13/14/15) | 11/5/43/419 | 54/29/86/395 | |
| #Hospital type (primary/secondary) | 395/83 | 397/167 | |
| *#Post-traumatic amnesia duration (none/ < 1 min/≥1 min) | 197/32/249 | 161/0/403 | |
| *CT result (without/with abnormality) | 254/224 | 3/561 | |
| Pupil reactivity at ED arrival (both/one/neither reactive) | 470/6/2 | 561/2/1 | |
| Blood work | #Alcohol intoxication at ED (no/yes) | 405/73 | 428/136 |
| #Any drug intoxication (no/yes) | 451/27 | 419/145 | |
| Vital signs | Diastolic blood pressure at ED (low/normal/high) | 0/389/89 | 75/440/49 |
| *#Systolic blood pressure at ED (low/normal/high) | 0/318/160 | 0/387/177 | |
| Heart rate at ED (low/normal/high) | 11/395/72 | 10/466/88 | |
| Temperature at ED (low/normal/high) | 12/457/9 | 3/536/25 | |
| O2 saturation at ED (low/normal/high) | 1/477/0 | 12/552/0 | |
| Respiratory rate at ED (low/normal/high) | 1/438/39 | 9/453/102 | |
| Complications and treatment at ED | Blood transfusion (no/yes) | 466/12 | 480/84 |
| #Hypotension (no/yes) | 469/9 | 315/249 | |
| Hypoxia (no/yes) | 456/22 | 523/41 | |
| Intubation (no/yes) | 466/12 | 564/0 | |
| Seizure (no/yes) | 470/8 | 563/1 |
Clinical variables found by SHC that significantly contribute to sub-classifying Track-TBI Pilot patients or COBRIT patients are indicated by “*” and “#,” respectively.