Table 4.

Test–retest and internal consistency reliability of the CHU9D at scale level, among school children in grades 1–9, and stratified by school stages (n = 242)

	Test–retest			Internal consistency
	Canonical correlation	Spearman correlation	ICC	Cronbach’s alpha
All	0.81	0.72	0.75	0.79
School stages
Grades 1–3	0.87	0.74	0.76	0.72
Grades 4–6	0.75	0.62	0.61	0.74
Grades 7–9	0.87	0.75	0.79	0.81

ICC intraclass correlation coefficients