Table 3. Psychometric properties of the Epworth Sleepiness Scale for Children in scale level .
| Psychometric testing | Value | Suggested cutoff |
| Ceiling effects (%) | 1.8 | <20 |
| Floor effects (%) | 0.8 | <20 |
| Internal consistency (Cronbach’s α) | 0.79 | >0.7 |
| CFA | ||
| χ2 (df) | 28.84 (20)a | Nonsignificant |
| Comparative fit index | 0.974 | >0.9 |
| Tucker-Lewis index | 0.919 | >0.9 |
| Root-mean square error of approximation | 0.040 | <0.08 |
| Standardized root mean square residual | 0.021 | <0.08 |
| Average variance extracted | 0.54 | >0.5 |
| Composite reliability | 0.90 | >0.6 |
| Standard error of measurement | 1.99 | The smaller the better |
| Item separation reliability from Rasch | 1.00 | >0.7 |
| Item separation index from Rasch | 21.55 | >2 |
| Person separation reliability from Rasch | 0.78 | >0.7 |
| Person separation index from Rasch | 2.53 | >2 |
| Test-retest reliability by ICCs | 0.84 | >0.4 |
Abbreviations: ICC, intraclass correlation coefficient.
a P < 0.001.