| MEASUREMENT PROPERTIES | |
| Limitations | |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
33-item dyspnea bank: 0.98; 10-item short form: 0.95. |
| B. Reliability intraobserver or test-retest | Not Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Not studied in patients with SSc. Cohen’s d effect sizes were mostly greater than 0.30 and were comparable to those of the SF-36, SGRQ, and HAQ-DI. Similar results were found when the discriminative validity of the FACIT-Dyspnea score was tested using a composite modified Medsger Scale. |
| C. Reliability interobserver or Measurement error | Not Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
|
| 2. VALIDITY | |
| A. Content validity: face validity | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
The reduced scale was constructed in such a way that it retained content validity, and it maximized information gained from patients with COPD |
| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Not Tested |
| Cross-cultural validity | Not Tested |
| Brief Description |
Construct validity in SSc (n = 73) was supported by correlations between the FACIT-Dyspnea severity and functional limitations scores and the SGRQ, MRC-DS, and HAQ-DI scores (r = 0.64-0.82; P < 0.01) |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
The FACIT-Dyspnea is able to discriminate between clinically distinct groups of patients with SSc based on the MRC-DS or the SSc Disease Severity Index. |