Table 1. Descriptive analysis (sex, age and cause of injury variables) of the total sample taken by center.

Variables	Total		HUMV		CHN
	n = 699		n = 344		n = 355
	M	SD	M	SD	M	SD	p
Age	52.7	29.2	53.2	29.2	52.2	29.3	0.82a
	n	%	n	%	n	%
Sex
Male	388	55.5	198	57.7	190	53.5	0.21b
Female	311	44.4	146	42.3	165	46.5
Causes
Falls	422	60.4	209	60.9	213	60
Road traffic crashes	83	11.9	52	15.1	31	8.7
Blow, crushing and traumatic contact	112	16	46	13.3	66	18.6
Unknown	49	7	23	6.7	26	7.3
Assaults	16	2.3	6	1.7	10	2.8
Self-inflicted injuries	6	0.9	3	0.9	3	0.8	0.14b
Exposure to hot liquids, gases or objects	3	0.4	-	-	3	0.8
Shots and explosions	2	0.3	1	0.3	1	0.3
Bites	2	0.3	1	0.3	1	0.3
Respiratory obstruction	2	0.3	1	0.3	1	0.3
Exposure to electricity, radiation and heat	2	0.3	2	0.6	-	-

^at-test

^bχ² test

M: Mean; SD: Standard deviation.