| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
IRT: Person separation index >0.9 |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
In order to investigate the test–retest reliability of the instrument, the questionnaire was administered twice to the sample, both times by post and separated by a period of two weeks. This revealed an ICC of 0.870 (p < 0.000). This set of reliability tests demonstrate good test–retest reliability and repeatability of the instrument |
| 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) |
Early research found the ENAT to be acceptable to patients |
| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Not Tested |
| Cross-cultural validity | Tested |
| Brief Description |
Confirmatory FA, structure detection & Rasch analysis has been done; . In RA and SSc, the 7 domains of the ENAT were found to fit the Rasch model, X 2(df) = 16.953(14), p = 0.259 and 8.132(14), p = 0.882 for RA and SSc, respectively. OA group was a misfit. |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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