Table 5.
Description of the psychometric characteristics of the final SeMaS
| Characteristic | n | PPV | NPV | Crohnbach’s alpha (α) for internal consistency | Correlation of sum score on SeMaS with sum score on original questionnaire |
|---|---|---|---|---|---|
| Self-efficacy | 182 | 57.1 | 79.8 | 0.86 | 0.418**a |
| Coping | 171 | 41.5 | 94.4 | 0.70 | 0.746** (P) |
| 0.73 | 0.800** (E) | ||||
| 0.56 | 0.783** (D) | ||||
| Depression | 192 | 67.9 | 99.4 | 0.87 | 0.805** a |
| Anxiety | 182 | 77.8 | 91.3 | 0.56 | 0.653** a |
| Locus of control | 147 | 67.6 | 53.3 | 0.02 | 0.472** |
| Social support | 191 | N.A. | N.A. | 0.63 | 0.626**a |
| Perceived burden of disease | 163 | N.A. | N.A. | N.A. | 0.554**a |
PPV percentage of patients with a barrier on SeMaS that has a barrier according to the original questionnaire
NPV percentage of patients with no barrier on SeMaS that has no barrier according to the original questionnaire
N. A. not applicable
Coping styles: (P) problem solving; (E) emotional; (D) distraction
a correlation: spearman’s rho; sum scores were not normally distributed
* p < 0.05; ** p < 0.01