Test–retest reliability of selected HBSC items in Vietnam: well-being, physical and sedentary activities, and eating behaviours

Table 1 Demographic characteristics of sample

	Class		Sex				Residence				Age
	n	%	Boy		Girl		Urban		Rural		Mean age	Standard Deviation
	n	%	n	%	n	%	n	%	n	%	Mean age	Standard Deviation
6^th grade	77	18.8	33	42.9	44	57.1	39	50.6	38	49.4	10.9	0.44
7^th grade	110	26.8	45	40.9	65	59.1	60	54.5	50	45.5	11.9	0.40
8^th grade	115	28.0	38	33.0	77	67.0	59	51.3	56	48.7	12.9	0.36
9^th grade	108	26.4	49	45.4	59	54.6	64	59.3	44	40.7	14.2	0.60
Total	410	100	165	40.2	245	59.8	222	54.1	188	45.9	12.6	1.24

ISSN: 1471-2288