| MEASUREMENT PROPERTIES | |
| Limitations | English only |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Not Tested |
| Cronbach's (Describe) | |
| B. Reliability intraobserver or test-retest | Not Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
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| 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 |
Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description |
A preliminary standard multiple regression analysis was performed with the 14 pain site variables and 21 SIQR variables to identify which variables were uniquely and statistically associated with FM vs. RA/SLE group membership. This analysis identified 11 significant variables: neck, P < 0.0009; arms, P < 0.002; hands, P < 0.003; lower back, P < 0.046; thigh, P < 0.033; feet, P < 0.007; tenderness to touch, P < 0.0001; cleaning floors, P < 0.002; sitting for 45 minutes, P < 0.003; depression, P < 0.01; and anxiety, P <0.034. Strongest differences in SIQR severity in FM patients were found in response to the question, “I have a persistent deep aching over most of my body” (F=87.5; p<0.0000; ηp 2 =0.53; MR=0.74). |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
A combination of two SIQR questions ("tenderness to touch” and “difficulty sitting for 45 minutes”) plus pain in four locations (lower back, neck, hands and arms) identified the correct diagnosis in 97% of patients. |