Table 3.

Median concentrations of S100B according to demographic characteristics, clinical evaluation, radiological findings, and mechanism of injury.

		n	S100B median (μg/L) (min; max; IQR)	p	P2
Demographics
Male		49	0.19 (0.05; 1.32; 0.14–0.37)	NS	NS
Female		81	0.22 (0.07; 1.42; 0.14–0.34)
<65 years old		101	0.21 (0.05; 1.42; 0.14–0.35)	NS	NS
≥ 65 years old		29	0.21 (0.08; 1.00; 0.15–0.34)
Clinical and radiological evaluation
GCS score of 13–14		22	0.26 (0.05; 1.42; 0.11–0.38)	NS	NS
GCS score of 15		108	0.20 (0.07; 1.32; 0.14–0.35)
CT–		97	0.18 (0.05; 1.42; 0.13–0.29)	<0.001	NA
CT+		33	0.35 (0.08; 1.32; 0.17–0.53)
No fractures (F0)		96	0.20 (0.05; 1.42; 0.13–0.34)	F1F2 vs. F0: 0.036	F1F2 vs. F0: NS
	F1F2	34	0.27 (0.08; 1.32; 0.16–0.44)	F1 vs. F0: NS	F1 vs. F0: NS
	F1	26	0.23 (0.09; 0.85; 0.16–0.85)	F2 vs. F0: 0.041	F2 vs. F0: 0.009
Fractures	F2	8	0.96 (0.08; 1.32; 0.31–1.2)	F2 vs. F1: 0.048	F2 vs. F1: 0.009
Non-polytrauma		118	0.20 (0.05; 1.42; 0.14–0.35)	0.004	NS
Polytrauma		12	0.52 (0.08; 1.32; 0.27–1.10)
Injury mechanism
Non-skiers		43	0.27 (0.05; 1.42; 0.14–0.41)	0.19	NA
Skiers		87	0.19 (0.05; 1.21; 0.13–0.34)
Using a helmet		76	0.17 (0.07; 1.21; 0.10–0.52)	NS	NA
Not using a helmet		11	0.20 (0.05; 1.2; 0.14–0.30)

A p-value of ≤ 0.05 is considered statistically significant. The multivariable analysis did not include non-significant results of the univariate analysis and did not include CT+. p, p-value of the median comparison; p2, p-value of the multivariate model; NA, Non Applicable; NS, Non Significant; GCS, Glasgow Coma Scale; CT–, negative computed tomography scan; CT+, positive computed tomography scan; F0, patients without fractures; F1, only one fracture; F2, two fractures or more; F1F2, F1 and F2 patients.