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Psychometric Testing of the Self-Care of Coronary Heart Disease Inventory Version 3.0
Insights
The updated Self-Care of Coronary Heart Disease Inventory (SC-CHDI) v3.0 demonstrates strong psychometric properties. This revised tool accurately measures essential self-care elements for adults with coronary heart disease.
Area of Science:
- Cardiology
- Health Psychology
- Psychometrics
Background:
- The Self-Care of Coronary Heart Disease Inventory (SC-CHDI) was updated to version 3.0.
- Items were added and revised to align with chronic illness self-care theory and recent research.
- The SC-CHDI v3.0 now incorporates theoretical concepts of self-care maintenance, monitoring, and management.
Purpose of the Study:
- To evaluate the psychometric properties of the SC-CHDI v3.0.
- To confirm the validity and reliability of the updated self-care inventory in adults with coronary heart disease.
Main Methods:
- Confirmatory factor analysis was used to test the validity of the SC-CHDI v3.0 in a sample of 205 adults with coronary heart disease.
- Reliability was assessed using Cronbach's alpha, factor score determinacy coefficient, and global reliability index.
- Adequate psychometric properties were defined as values > 0.70.
Main Results:
- The self-care maintenance scale showed two distinct behaviors: illness-related and health-promoting.
- The self-care monitoring scale yielded excellent goodness-of-fit indices, indicating a single factor.
- The self-care management scale demonstrated two dimensions (autonomous and consulting behavior) with strong goodness-of-fit indices.
- All scales exhibited reliability estimates of 0.80 or higher.
Conclusions:
- The SC-CHDI v3.0 is a psychometrically sound instrument.
- The inventory effectively measures the essential components of self-care for individuals with coronary heart disease.
Background:
In this updated Self-Care of Coronary Heart Disease Inventory (SC-CHDI) v3.0, items were added to better reflect the theory of self-care of chronic illness and revised based on recent research. The expanded SC-CHDI now reflects the theoretical concepts of self-care maintenance, monitoring, and management.
Objective:
The aim of this study was to evaluate the psychometric properties of the SC-CHDI v3.0.
Methods:
In a sample of adults with coronary heart disease, we tested the SC-CHDI v3.0 validity with confirmatory factor analysis. Reliability was calculated using Cronbach α, factor score determinacy coefficient, and global reliability index for multidimensional scales, with values > 0.70 considered adequate.
Results:
The sample (n = 205) was predominantly male (79%) with a mean age of 65.3 ± 11.1 years. The self-care maintenance scale encompassed 2 distinct behaviors, namely, "illness related behaviors" and "health promoting behaviors," which reflect consulting and autonomous dimensions, respectively. The goodness-of-fit indices were adequate: χ2(25, N = 205) =31.86, P = .16, comparative fit index = 0.97, Tucker-Lewis Index = 0.95, root mean square error of approximation = 0.04 (90% confidence interval, 0.00-0.07), P = .705, and standardized root mean square residual = 0.045. Analysis of the new self-care monitoring scale yielded a single factor; goodness-of-fit indices were excellent: χ2(12, N = 205) =11.56, P = .48, comparative fit index = 1.00, Tucker-Lewis Index = 1.00, root mean square error of approximation < 0.001 (90% confidence interval, 0.000-0.07), P = .86, and standardized root mean square residual = 0.02. The self-care management scale had 2 dimensions of autonomous and consulting behavior with strong goodness-of-fit indices: χ2(7, N = 205) =6.57, P = .47, comparative fit index = 1.00, Tucker-Lewis Index = 1.00, root mean square error of approximation ≤ 0.001 (90% confidence interval, 0.00-0.08), P = .76, and standardized root mean square residual = 0.02. Reliability estimates were ≥0.80 for all scales.
Conclusions:
Our testing suggests that the SC-CHDI v3.0 is a sound measure of the essential elements of self-care for adults with coronary heart disease.
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