| MEASUREMENT PROPERTIES | |
| Limitations | |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
Sixteen studies reported on the internal consistency reliability of the multi-item fatigue subscales. The following were reported on all five of the subscales: physical mean α = 0.84 (95% CI 0.81-0.86), general mean α = 0.93 (95% CI 0.91-0.95), mental mean α = 0.87 (95% CI 0.85-0. 90), emotional mean α = 0.90 (95% CI 0.87-0.94), and vigor mean α = 0.86 (95% CI 0.82-0.89). The mean Cronbach's α coefficient for total fatigue was 0.87 (95% CI 0.83-0.91) and ranged from 0.74 to 0.95 for the different subscales |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
In the original study, the scales produced moderate correlations between assessments at 3- to 4-week intervals (mean 0.56, 95% CI 0.50-0.62) and 6- to 8-week intervals (mean 0.64, 95% CI 0.59-0.69) in a group of patients with breast cancer who were about to start active treatment or in the post-treatment period and in a control group without cancer. The test-retest correlation, for example, was r = 0.55, an acceptable value, for vigor between the first and second administration of the MFSI-SF and 0.64 between the first and third administration. Test-retest correlations for mental fatigue were 0.64 in the first interval and 0.70 in the second interval |
| 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 | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
The items cover a range of severity and impact of fatigue |
| 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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