Table 3 Bi-variable and multivariable Weibull regression analysis for independent predictors of time to death among TBI patients admitted in n Amhara region, 2022

Age in years

Cont.

81(14.8)

463(85.1)

1.06(1.04–1.07)

1.08(1.06–1.1)

< 0.001^*

Residence

Urban

20(11.7)

151(88.3)

1

1

1

Rural

61(16.35)

312(83.65)

1.81(1.08-3).

1.05(0.59–1.88)

0.847

Extra-cranial injury

Present

52(31.71)

112(68.29)

3.9(2.5–6.4)

1(0.58–1.73)

0.985

Absent

29(7.63)

351(92.37)

1

1

1

Type of head injury

Blunt

18(13.74)

113(86.26)

1.4(0.82–2.4)

3.2(1.5–6.8)

0.002^*

Penetrating

63(15.25)

350(84.75)

1

1

1

The severity of the head injury

Mild

6(2.03))

289(97.97)

1

1

1

Moderate

16(9.64)

150(90.36)

4.5(1.8–11.6)

9.2(2.97-29)

< 0.001*

Sever

59(71.08)

24(28.92)

23(10–54)

10(3.6–28.2)

< 0.001*

Pupillary reactivity

Bilateral reactive

23(5.3%)

411(94.7%)

1

1

1

Unilateral reactive

22(34.38)

42(65.63%)

5.6(3.1–10)

0.88(0.42–1.85)

0.749

Both non-reactive

36(78.26)

10(21.74)

8.9(5.2–15)

0.74(0.33–1.65)

0.466

Seizure

Yes

24(36.92)

41(63.08)

3.9(2.9–6.4)

1.15(0.51–2.57)

0.733

No

57(11.9)

422(88.1)

1

1

1

Hypoxia

Yes

32(76.19)

10(23.81)

6.6(4.2–10)

1.46(0.79–2.72)

0.223

No

49(9.76)

453(90.24)

1

1

1

Comorbidity

Yes

6(40)

9(60)

3.4(1.5–7.8)

0.36(0.11–1.13)

0.081

No

75(14.18)

454(85.82)

1

1

1

Coagulopathy

Yes

21(52.5)

19(47.5)

2.5(1.5–4.15)

2.48(1.19–5.17)

0.015

No

60(11.9)

444(88.1)

1

1

1

Aspiration pneumonia

Yes

53(55.79)

42(44.21)

7.5(4.7–11.8)

3.2(1.76–5.9)

< 0.001*

No

28(6.24)

421(93.76)

1

1

1

Fever

Yes

64(28.26)

157(71.04)

5.7(3.3–9.7)

2.79(1.4–5.5)

0.004^*

No

17(5.26)

306(94.74)

1

1

1

Hypotension

Yes

24(61.5)

15(38.5)

5.04(3.1–8.1)

6.9(2.8–17.1)

< 0.001*

No

57(11.3)

448(87.7)

1

1

1

Hyperglycemia

No

46(10.62)

387(89.38)

1

1

1

Yes

35(31.53)

76(68.47)

2.3(1.5–3.7)

2.28(1.13–4.6)

0.020^*

Neurosurgery

Yes

24(9.72)

223(90.28)

0.4(0.25–0.65)

0.47(0.27-0 0.82)

0.008 ^*

No

57(19.19)

240(80.81)

1

1

1