Table 1. Characteristics of mTBI patients, ≤ 6 h post-trauma.

	CT-	CT+	p-value†
CT scan, n (%)	140 (81)	32 (19)
Trauma to blood sample (min)			0.818‡
Mean (SD)	199 (86)	194 (96)
Median (min.–max.)	203 (35–360)	208 (40–360)
Age (years), mean (SD)	46 (20)	61 (25)	0.001‡
Male, n (%)	101 (72)	23 (72)	0.976
Symtoms, y (%)
Amnesia	84 (60)	24 (75)	0.113
LOC	113 (81)	27 (84)	0.631
Nausea/vomiting	31 (22)	9 (28)	0.47
Headache	59 (42)	8 (25)	0.073
Impaired equilibrium	2 (1)	0 (0)	1
Mechanism of Injury, n (%)
Traffic accident	36 (26)	10 (31)	0.523
Fall	52 (37)	10 (31)	0.531
Assault	25 (18)	5 (16)	0.764
Sports	4 (3)	1 (3)	0.648
Others	19 (14)	6 (19)	0.307
NA	4 (3)
Isolated brain trauma, y (%)	100 (72)	24 (75)	0.727
NA	1 (1)

^† Chi-square test or Fisher’s exact test

^‡ Mann-Whitney U test

NA: not available