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Table 3 Incidence rate, mean survival time (days) and log rank test comparing between different categorical variables of the study

From: Incidence and predictors of acute kidney injury among traumatic brain injury patients in Northwest Ethiopia: a cohort study using survival analysis

Variable

Category

Incidence rate

(95%CI)

Mean (Surv.time)

(95%CI)

Log rank

Injury severity

Mild

Moderate

Sever

0.0017(0.0006–0.0045)

0.0044(0.0024–0.0082)

0.0183(0.0132–0.0256)

46.38(42.85–49.92)

39.91(36.53–43.28)

33.14(29.22–37.05)

0.0001

SBP

Hypotension

Normal

Hypertension

0.0330(0.0213–0.0511)

0.0045(0.0031–0.0067)

0.0092(0.0034–0.0244)

25.12(20.11–30.13)

42.45(38.96–45.94)

32.29(28.23–36.37)

< 0.0001

Pneumonia

(aspiration)

Yes

No

0.0217(0.0149–0.0316)

0.0041(0.0027–0.0062)

30.79(26.31–35.26)

41.54(38.36–44.73)

< 0.0001

DM

Yes

No

0,0191(0.0127–0.0288)

0.0048(0.0033–0.0071)

31.69(27.65–35.73)

37.36–45.14

0.0056

Pupillary reactivity

Both reactive

Both unreactive

One reactive

0.0026(0.0015–0.0048)

0.0313(0.0191–0.0501)

0.0117(0.0077–0.0178)

42.19(38.08–46.31)

27.09(20.08–34.10)

35.18(31.77–38.61)

0.0001

Mannitol

Yes

No

0.0133(0.0093–0.0189)

0.0044(0.0028–0.0069)

35.80(31.73–39.88)

39.80(35.85–43.76)

0.0352

ICU

Yes

No

0.0214(0.0149–0.0306)

0.0037(0.0023–0.0058)

31.96(27.49–36.43)

40.99(37.11–44.88)

0.0001