Study of the Long-Term Results of Decompressive Craniectomy after Severe Traumatic Brain Injury Based on a Series of 60 Consecutive Cases

Table 3

Analysis of prognostic factors for mortality.

	Deceased patients	Surviving patients	𝑃 value
	𝑛=17	𝑛=43
Age
<15 years	4	4	0.097^ω
15 to 30 years	7	14
>30 years	6	25
Gender
Male	13	33	0.750^𝜒
Female	4	10
Pupillary examination
Constricted	3	23	0.003 ^ω
Unilateral dilated	6	15
Bilateral dilated (absent corneal reflex)	8 (4)	5 (2)
Initial Glasgow score
3 to 5	13	13	0.014 ^ω
6 to 8	2	15
>8	2	15
mean	4.3	8.0
Time to surgery
<6 h	7	13	0.183^ω
6 h–24 h	3	4
24 h–7 days	7	23
>7 days	0	3
Bone flap area (cm^2) (mean ± SD)	103.2±24.2	98.7±21.3	0.555^ω
Marshall score
I	2	12	0.403^ω
II	3	9
III	0	1
IV	4	13
Evacuated mass	8	8

Comparison of the group of deceased patients and the group of surviving patients as a function of various prognostic criteria. A criterion was considered to have a prognostic value when a statistically significant difference was observed between the 2 groups with 𝑃 < 0.05 (𝛼 = 5%).
𝜔Welch’s 𝑡-test; 𝜒Chi² test.