| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations |
Ritter and Lorig (2014) conducted two new studies and reviewed eight independent studies to investigate the psychometric properties of the scale. This report of psychometric properties of the English- and Spanish-language Self-Efficacy for Managing Chronic Disease scales (SEMCD and SEMCD-S). A German version and 4-item Spanish version are also available. The completion rates (completing at least two third of the items) for the SEMCD and SEMCD-S were high, varying from 98.7% to 100%. |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
Cronbach's alpha was a minimum of .88 across all studies. |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Test-retest reliability was estimated which revealed a high interclass correlation coefficient (ICC = 0.87-0.997). |
| 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 content validity of the SEMCD was interpreted as satisfactory. |
| B. Construct Validity: Structural validity |
Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Tested |
| Brief Description |
Requiring a minimum eigenvalue of 1.0 resulted in only a single component being generated for both scales. If a second component were forced, eigenvalue for those components would be 0.713 for the SEMCD and 0.276 for the SEMCD-S. When principal component analyses were performed within each study separately, only a single factor was generated in all eight studies. In none of the eight studies was the eigenvalue for a second component as great as 0.8. |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
No gold standard for self-efficacy available. |