| MEASUREMENT PROPERTIES | |
| Limitations | <5 European languages (English) |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
Crohnbach’s α =0.892. |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Patients were questioned 1-2 weeks after the baseline visit, whether they felt that their health status was stable, better or worse compared to the previous visit. Twenty-one PSS patients with stable health status were subsequently asked to complete the PSS-Qol a second time. Results of both PSS-QoL assessments were then compared. Reliability of the PSS-QoL in these patients was high yielding an ICC of 0.958 (95% CI 0.926 to 0.981). |
| 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) |
Face validity was tested by semi-structured interviews with patients and physicians and feasibility was determined by the percentage of missing data for each of the questions. |
| B. Construct Validity: Structural validity |
Not Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | 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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