Appropriate (n = 152)

Overtriage (n = 55)

Odds Ratio

95% CI

P

Age^‡

80 (73 - 85)

80 (75 - 87)

1.008

0.971 - 1.047

0.672

ISS^‡

16 (9 - 16)

9 (9 - 16)

0.943

0.880 - 1.011

0.609

Admit GCS

15

115 (75.7)

46 (83.6)

1.761

0.860 - 3.605

0.122

14

30 (19.7)

9 (16.4)

0.750

0.330 - 1.702

0.491

13

7 (100)

-

-

Comorbidities

Hypertension

134 (88.2)

48 (87.3)

0.921

0.362 - 2.342

0.863

Dementia

61 (40.1)

24 (43.6)

1.155

0.619 - 2.155

0.651

Atrial fibrillation

45 (29.6)

5 (9.1)

0.238

0.089 - 0.635

0.002

CHF

34 (22.4)

4 (7.3)

0.272

0.092 - 0.807

0.013

RF/CKD

17 (11.2)

1 (1.8)

0.147

0.019 - 1.132

0.035

COPD

16 (10.5)

3 (5.5)

0.490

0.137 - 1.753

0.264

Hx CVA

25 (16.4)

4 (7.3)

0.398

0.132 - 1.202

0.093

CAD

46 (30.3)

15 (27.3)

0.864

0.435 - 1.718

0.677

Prior TBI

6 (3.9)

1 (1.9)

0.459

0.054 - 3.903

0.465

# of comorbidities

0

6 (3.9)

5 (9.3)

2.483

0.726 - 8.496

0.136

1

20 (13.2)

14 (25.9)

2.310

1.070 - 4.985

0.030

2

33 (21.7)

16 (29.6)

1.518

0.754 - 3.057

0.240

3

41 (27.0)

11 (20.4)

0.693

0.326 - 1.470

0.337

≥4

52 (34.2)

8 (14.8)

0.334

0.147 - 0.761

0.007

Pre-injuryAT therapy

None

58 (38.2)

29 (52.7)

1.808

0.970 - 3.368

0.061

Antiplatelet

59 (38.8)

22 (40)

1.051

0.559 - 1.974

0.877

Anticoagulant

29 (19.1)

3 (5.5)

0.245

0.071 - 0.839

0.017

Both

6 (3.9)

1 (1.8)

0.451

0.053 - 3.830

0.454

TBI type, n (%)

SDH

73 (48.0)

28 (50.9)

1.122

0.606 - 2.080

0.714

SAH

29 (19.1)

17 (30.9)

1.897

0.942 - 1.536

0.071

IPH

4 (2.6)

2 (3.6)

1.396

0.248 - 7.845

0.703

Other ICH

20 (13.2)

5 (9.1)

0.660

0.235 - 1.854

0.428

Multiple TBI

26 (17.1)

3 (5.5)

0.280

0.081 - 0.964

0.033