| MEASUREMENT PROPERTIES | |
| Limitations | |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
In CFS, for total CIS20R score, Cronbach's α was 0.90, and Gutman split-half reliability coefficient was 0.92; Cronbach's α for subscales ranged from 0.83 to 0.92. In patients with RA (n = 227), Cronbach's α for the subjective fatigue CIS8R was 0.92, and it was 0.89 in patients with FMS (n = 78). In all these analyses, the results were excellent. In patients with RA, factor analysis was reported as confirming the four subscales (no detailed data were provided) (n = 227) |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
The subscale's reliability coefficient for the CIS was 0.94 at baseline and 0.92 at follow-up , which are excellent In 227 patients with RA, the intraclass correlation coefficient (ICC) of subjective fatigue CIS8R over 1 month was 0.81, an excellent value. |
| C. Reliability interobserver or Measurement error | Not Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
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| 2. VALIDITY | |
| A. Content validity: face validity | Not Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
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| B. Construct Validity: Structural validity |
Not Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description | |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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