| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations |
Heaney et al. conducted a literature search to identify published articles reporting on the use of the RAQoL. Psychometric and clinical research studies were included in the review. They concluded that the RAQoL has excellent psychometric properties and can detect the impact of both clinical and non-clinical interventions. |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
0.92-0.94 |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Spearman’s rank correlation coefficient: 0.90; Intraclass correlation coefficient >0.90. |
| C. Reliability interobserver or Measurement error | Not Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
|
| 2. VALIDITY | |
| A. Content validity: face validity | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
The questionnaire was delevoped based on qualitative interviews with RA patients in the Netherlands and the UK (25 patients in each country). |
| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description |
Principal component analysis revealed 4 primary factors with high reliability (Cronbach’s alpha): mobility/energy 0.79, self-care 0.75, mood/emotion 0.71, and physical contact 0.54. |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
RAQOL scores correlate with other measures of quality of life in RA cohorts including a rating scale utility (r= - 0.63) and EuroQol 5-domain (EQ-5D) (r= - 0.62 to - 0.76) |