Table 1.

Demographics and clinical characteristics

Variables	Early group (n = 291)	Late group (n = 223)	p value
Age, years	65.0 (51.3–73.0)	65.0 (53.3–76.0)	0.50
Male, sex	240/290 (82.8)	185/223 (83.0)	0.95
Prehospital sBP	123 (100–144)	128 (106–147)	0.75
Prehospital PR	74 (63–84)	72 (64–83)	0.97
Prehospital RR	18 (18–24)	20 (18–24)	0.33
sBP on arrival	124 (106–143)	132 (109–152)	0.04
PR on arrival	70 (60–82)	70 (62–83)	0.88
RR on arrival	20 (16–22)	20 (16–23)	0.43
Body temperature on arrival	36.1 (35.4–36.7)	36.3 (35.6–36.8)	0.84
GCS on arrival	15 (14–15)	15 (14–15)	0.54
Injury Severity Score	16.5 (16.0–25.0)	16.0 (14.0–21.8)	< 0.01
Cervical Abbreviated Injury Score			< 0.01
2	14/291 (4.8)	15/223 (6.7)
3	46/291 (15.8)	57/223 (25.6)
4	124/291 (42.6)	103/223 (46.2)
5	107/291 (36.8)	48/223 (21.5)
Cause of injury			0.96
Traffic accident	72/290 (24.8)	56/221 (25.3)
Fall	189/290 (65.2)	146/221 (66.1)
Sports	12/290 (4.1)	8/221 (3.6)
Others	17/290 (5.9)	11/221 (5.0)

Data given as number of positive observations/total number of observations (percentage) or as median (interquartile range). For each variable, the number of missing observations can be obtained as the difference between the total number of patients in each phase and the total number of observations. sBP systolic blood pressure, PR pulse rate, RR respiratory rate, GCS Glasgow Coma Scale