Table 4.
Convergent validity analysis, correlation between 4-item and HELENA questionnaires.
| Items in children (N=237) | rho |
|---|---|
| (SAYCARE) Time spent in beda on weekdays vs (HELENA) Habitual sleep time on weekdays | 0.62** |
| (SAYCARE) Time spent in beda on weekend days vs (HELENA) Habitual sleep time on weekend days | 0.48** |
| (SAYCARE) Time spent in beda on total days vs (HELENA) Habitual sleep time on total days | 0.50** |
| Items in adolescents (N=258) | rho |
| (SAYCARE) Time spent in beda on weekdays vs (HELENA) Habitual sleep time on weekdays | -0.28 |
| (SAYCARE) Time spent in beda on weekend days vs (HELENA) Habitual sleep time on weekend days | -0.12 |
| (SAYCARE) Time spent in beda on total days vs (HELENA) Habitual sleep time on total days | 0.20 |
Moderate (or above) values of spearman correlation was set in rho≥0.30; HELENA: Healthy Lifestyle in Europe by Nutrition in Adolescence study; rho: Spearman correlation coefficient; SAYCARE: South American Youth Cardiovascular and Environmental study;
a
Based on the equation: (bedtime in clock time) - (wake up in clock time);
*
p <0.05;
**
p≤0.01.