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Table 1 Demographic characteristics of sample

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

  Class Sex Residence Age
n % Boy Girl Urban Rural Mean age Standard Deviation
n % n % n % n %
6th grade 77 18.8 33 42.9 44 57.1 39 50.6 38 49.4 10.9 0.44
7th grade 110 26.8 45 40.9 65 59.1 60 54.5 50 45.5 11.9 0.40
8th grade 115 28.0 38 33.0 77 67.0 59 51.3 56 48.7 12.9 0.36
9th 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