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Table 2 Demographic, clinical, and facility characteristics and cumulative mortality

From: Demographic and clinical risk factors associated with hospital mortality after isolated severe traumatic brain injury: a cohort study

Exposure

Total patients

Number died

Cumulative mortality (%)

95 % CI

Demographic characteristics

    

Age

    

 18–44

9832

766

7.80

7.3–8.3 %

 45–64

10,749

994

9.20

8.7–9.8 %

 65–79

10,460

1137

10.90

10.3–11.5 %

 80+

10,549

1331

12.60

12.0–13.3 %

Gender

    

 Male

26,604

2856

10.70

10.4–11.1 %

 Female

14,927

1371

9.20

8.7–9.7 %

Clinical characteristics

    

Cardiovascular

    

 Admission hypotension (SBP <90 mmHg)

524

158

30.20

26.2–34.3 %

 Admission normotension (SBP ≥90 mmHg)

32,700

3437

10.50

10.2–10.8 %

 Admission heart rate <60 bpm

2184

352

16.10

14.6–17.7 %

 Admission heart rate 60–100 bpm

24,790

2401

9.70

9.3–10.1 %

 Admission heart rate >100 bpm

6407

883

13.80

12.9–14.7 %

Respiratory

    

 Need for mechanical ventilation during hospitalization

10,239

2927

28.60

27.7–29.5 %

 No need for mechanical ventilation during hospitalization

31,351

1301

4.10

3.9–4.4 %

Injury severity

    

 ISS <9

1330

44

3.30

2.4–4.4 %

 ISS 9–15

11,476

431

3.80

3.4–4.1 %

 ISS 16+

26,704

3481

13.00

12.6–13.4 %

Neurologic

    

 GCS 13–15

23,346

1276

5.50

5.2–5.8 %

 GCS 9–12

3156

449

14.20

13.0–15.5 %

 GCS ≤8

5096

1770

34.70

33.4–36.1 %

Facility characteristics

    

Teaching status

    

 Community/non-teaching hospital

23,985

2246

9.40

9.0–9.7 %

 University/teaching hospital

17,605

1982

11.30

10.8–11.7 %

Hospital bed size

    

 Small (<200 beds)

2139

187

8.70

7.6–10.0

 Medium (201–400 beds)

12,382

1188

9.60

9.1–10.1 %

 Large (>400 beds)

27,069

2853

10.50

10.2–10.9 %

Trauma hospital designation

    

 Trauma hospital

26,006

2648

10.20

9.9–10.6 %

 Non-trauma hospital

14,778

1529

10.30

9.9–10.8 %

  1. All total patient columns do not add up to the same value due to missing data