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 |