TABLE 2.
Reliability and validity analysis of the final 19-item Acne-QoL-Br
| C | N | Self-perception | Role-social | Role-emotional | Acne symptoms | |
| Internal consistency | α | 80 | 0.852 | 0.879 | 0.764 | 0.692 |
| Test-retest reproducibility | ICC | 42 | 0.836 | 0.782 | 0.795 | 0.768 |
| Content validity | α | 80 | 0.852 | 0.879 | 0.764 | 0.692 |
| Acne duration (years) | r | 80 | -0.203 | -0.200 | -0.3336* | -0.2416* |
| Convergent validity SF-36 domains | ||||||
| Physical functioning | R | 0.186 | 0.106 | -0.017 | 0.082 | |
| Role-physical | R | 0.064 | 0.064 | -0.168 | -0.207 | |
| Bodily pain | R | 0.107 | 0.147 | 0.033 | 0.042 | |
| General health | R | -0.029 | 0.053 | -0.195 | -0.093 | |
| Vitality | R | 0.134 | 0.208 | 0.086 | 0.036 | |
| Social functioning | R | 0.456* | 0.386* | 0.258* | 0.225* | |
| Role-emotional | R | 0.174 | 0.042 | -0.065 | 0.083 | |
| Mental health | R | 0.265* | 0.235* | 0.183 | 0.056 | |
Legend: Acne-QoL-Br = Brazilian-Portuguese version of acne-specific quality of life questionnaire; C = correlation coefficient; α = Cronbach's coefficient; ICC = intraclass correlation coefficient; r = Pearson's correlation coefficient; R = Spearman's correlation coefficient.
*
p < 0.05