(A) Reliability statistics (Cronbach’s alpha), (B) ΚΜΟ and Bartlett test of sphericity, and (C) intercorrelation matrix of the 21 items of DASS-21
| (A) Cronbach’s alpha value of the survey | |||
| Subscale (factor) | No of Items | Cronbach’s alpha | |
| Depression | 3, 5, 10, 13, 16, 17, 21 (DQ1–DQ7) | 0.830 | |
| Anxiety | 2,4,7,9,15,19,20 (AQ1–AQ7) | 0.656 | |
| Stress | 1,6,8,11,12,14,18 (SQ1–SQ7) | 0.876 | |
| Overall | 1–21 | 0.915 | |
| (B) KMO and Bartlett’s test | |||
| KMO measure of sampling adequacy | 0.838 | ||
| Bartlett’s test of sphericity | Approximate χ2 | 1914.511 | |
| Degrees of freedom | 210 | ||
| Significance | 0.000 | ||
| (C) Inter-item correlation matrix | |||
| DASS-D score | DASS-A score | DASS-S score | |
| Depression | 1000 | ||
| Anxiety | 0.596* | 1000 | |
| Stress | 0.754* | 0.668* | 1000 |
*Correlation is significant at the 0.01 level (2-tailed)
DASS-21, Depression–Anxiety–Stress Scales-21; KMO, Kaiser-Meyer-Olkin.