Table 2.
Internal consistancy relaibility of BDDS-17 and its domains (n = 1184).
| Items | Mean score (SD) | Cronbach's alpha | Domain total correlation | ||
|---|---|---|---|---|---|
| Coefficient | p value | ||||
| Total score | 1–17 | 2.33 (0.7) | 0.838 | – | – |
| Regimen-related distress domain | 5, 6, 10, 12, 16 | 1.27 (0.6) | 0.840 | 0.561 | < 0.001 |
| Emotional burden domain | 1, 3, 8, 11, 14 | 3.3 4(1.4) | 0.816 | 0.690 | < 0.001 |
| Physician-related distress domain | 2, 4, 9, 15 | 2.55 (1.3) | 0.698 | 0.779 | < 0.001 |
| Interpersonal distress domain | 7, 13, 17 | 1.73 (1.3) | 0.878 | 0.649 | < 0.001 |
Cronbach's Alpha and its 95% CI of the 17-item scale and of each of the 4 domains are generated. Correlation coefficient and p value for the domain total correlation are presented in the right two columns.