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Table 4 Sample characteristics - Nominal and ordinal variables

From: Prediction of in-hospital mortality in patients with post traumatic brain injury using National Trauma Registry and Machine Learning Approach

Variable Category Count/% With Outcome 0 (Alive)/% With Outcome 1 (Dead)/%
Race Asian 977/60.3% 858/87.8% 119/12.2%
Other 643/39.7% 559/86.9 84/13.1%
Total/% 1620/100% 1417/87.5% 203/12.5%
Mechanism of Injury (MOI) MVC1 486/30% 413/85% 73/15%
Fall 551/34% 495/89.8% 56/10.2%
Pedestrian 268/16.5% 216/80.6% 52/19.4%
Other 315/19.4% 293/93% 22/7%
Total/% 1620/100% 1417/87.5% 203/12.5%
Arrival mode Ambulance 1350/83.3% 1167/86.4% 183/13.5%
Other 270/16.7% 250/92.6% 20/7.4%
Total/% 1620/100% 1417/87.5% 203/12.5%
Midline shift No 1260/77.8% 1155/91.7% 105/8.3%
Yes 360/22.2% 262/72.8% 98/27.2%
Total/% 1620/100% 1417/87.5% 203/12.5%
CT findings/mass lesion SDH2 455/28.1% 380/83.5% 75/16.5%
EDH3 371/22.9% 352/94.9% 19/5.1%
SAH4 152/9.4% 114/75% 38/25%
CONT5 321/19.8% 303/94.4% 18/5.6%
DAI6 120/7.4% 99/82.5% 21/17.5%
Other 201/12.4% 169/84.1% 32/15.9%
Total/% 1620/100% 1417/87.5% 203/12.5%
Cerebral edema No 1517/93.6% 1370/90.3% 147/9.7%
Yes 103/6.4% 47/45.6% 56/54.4%
Total/% 1620/100% 1417/87.5% 203/12.5%
Facial bones fracture No 981/60.6% 857/87.4% 124/12.6%
Yes 639/39.4 560/87.6% 79/12.4
Total/% 1620/100% 1417/87.5% 203/12.5%
Lung contusion No 1273/78.6% 1152/90.5% 121/9.5%
Yes 347/21.4% 265/76.4% 82/23.6%
Total/% 1620/100% 1417/87.5% 203/12.5%
Hemothorax No 1482/91.5% 1319/89% 163/11%
Yes 138/8.5% 98/71% 40/29%
Total/% 1620/100% 1417/87.5% 203/12.5%
Pneumothorax No 1387/85.6% 1251/90.2% 136/9.8%
Yes 233/14.4% 166/71.2% 67/28.8%
Total/% 1620/100% 1417/87.5% 203/12.5%
Abdominal organ injuries No 1417/87.5% 1278/90.2% 139/9.8%
Yes 203/12.5% 139/68.5% 64/31.5%
Total/% 1620/100% 1417/87.5% 203/12.5%
GCS category 13–15 893/55.1% 875/98% 18/2%
9–12 122/7.5% 113/92.6% 9/4.4%
≤ 8 605/37.3% 429/70.9% 176/29.1%
Total/% 1620/100% 1417/87.5% 203/12.5%
Shift 7 am-6:59 pm 858/53% 758/88.3% 100/11.7%
7 pm-6:59 pm 762/47% 659/86.5% 103/13.5%
Total/% 1620/100% 1417/87.5% 203/12.5%
Known comorbidities No 1328/82% 1167/87.9% 161/12.1%
Yes 292/18% 250/85.6% 42/14.4%
Total/% 1620/100% 1417/87.5% 203/12.5%
Intubation No 848/52.3% 847/99.9% 1/0.1%
Yes 772/47.7% 570/73.8% 202/26.2%
Total/% 1620/100% 1417/87.5% 203/12.5%
VTE7prophylaxis No 656/40.5% 537/81.9% 119/18.1%
Yes 964/59.5% 880/91.3% 84/8.7%
Total/% 1620/100% 1417/87.5% 203/12.5%
Blood transfusion No 1013/62.5% 989/97.6% 24/2.4%
Yes 607/37.5% 428/70.5% 179/29.5%
Total/% 1620/100% 1417/87.5% 203/12.5%
  1. (1) MVC Motor Vehicle Crash, (2) SDH Subdural Hemorrhage, (3) EDH Epidural Hemorrhage, (4) SAH Subarachnoid Hemorrhage, (5) CONT Hemorrhagic Contusion, (6) DAI Diffuse Axonal Injury, (7) VTE Venous Thromboembolism