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

Table 4

Analysis of prognostic factors for functional outcome.

	GOS 2 + 3	GOS 4 + 5	𝑃 value
	𝑛=13	𝑛=30
Age
<15 years	2	2	0.125^ω
15 to 30 years	6	8
>30 years	5	20
Gender
Male	10	23	0.706^𝜒
Female	3	7
Pupillary examination
Constricted	6	17	0.310^ω
Unilateral dilated	4	11
Bilateral dilated (absent corneal reflex)	3 (0)	2 (1)
Initial Glasgow score
3 to 5	7	6	0.048 ^ω
6 to 8	3	12
>8	3	12
Mean	6.2	8.8
Time to surgery
<6 h	5	8	0.800^ω
6 h–24 h	1	3
24 h–7 days	5	18
>7 days	2	1
Bone flap area (cm^2) (mean ± SD)	101.1 ± 25.2	99.3 ± 19.6	0.926^ω
Marshall score
I	2	10	0.500^ω
II	4	5
III	0	1
IV	2	11
Evacuated mass	5	3

Comparison of the group of patients with an unfavourable functional outcome (GOS 2 and 3) and the group of patients with a favourable functional outcome (GOS 4 and 5) 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.