| MEASUREMENT PROPERTIES | |
| Limitations | <5 European languages (English) |
| Observations |
RACER is available in English and French |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
The RACER instrument exhibited good internal consistency in five of its six subscales (Cronbach’s α > 0.7). All but one domain met the criteria for internal consistency (General Knowledge a = 0.63). Medication Knowledge (0.92), Planning for Adult Life (0.75), Managing Your Health Condition (0.76), Speaking Up for Yourself (0.85), Knowing How to Get Around the Healthcare System (0.86) all met the threshold of 0.70. |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
The ICC for the RACER instrument compared at T1 and T2 was 0.83 (95 % CI 0.79–0.86), |
| 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) |
Fifteen clinical and research experts participated in content validation along with 30 adolescents with JIA. Results supported the comprehensiveness, relevance, and understanding of the RACER in adolescents with JIA. Based upon the content validity ratios and respondent feedback, minor changes were implemented. The revised RACER consisted of 32 self-report items, organized into the 6 domains noted above. |
| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description |
The correlations of each of the items within each domain were moderately to strongly correlated to one another (r ≥ 0.3) |
| C. Criterion validity | Not Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
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