| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
The instrument demonstrated high internal consistency on 3 administrations (Cronbach’s alpha = 0.87, 0.91, 0.92) |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
The instrument was reliable in test-retest administrations in stable subjects (ICC = 0.65) |
| 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 | Tested |
| Brief Description |
All 7 items were retained on the basis that they each significantly contributed to the Significant correlations were detected between the patient satisfaction scores and NBQ ( r = − 0.533, p < 0.001 ). Significant correlations were found between the changes in VAS-pain scores after the treatment and the changes in NBQ (r = 0.587, p < 0.001). Additionally, significant correlations were determined between the changes in VAS-disability scores and the changes in NBQ and (r = 0.685, p < 0.001 ). |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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