Table 4.
Psychometric properties of LMC SCPI index for 25 items
| Measure | Statistic | |
|---|---|---|
| Reliability | ||
| Internal consistency for subscales | ||
| Skills | Cronbach’s alpha (95% CI) | 0.85 (0.81- 0,89); 9 items |
| Confidence | Cronbach’s alpha (95% CI) | 0.83 (0.78–0.87); 8 items |
| Preparedness | Cronbach’s alpha (95% CI) | 0.88 (0.84–0.91); 8 items |
| Test-retest reliability | Pearson’s correlation coefficient; p-value | 0.48; <0.001*** |
| Validity | ||
| Convergent validity | ||
| Diabetes Empowermenta | Pearson’s correlation coefficient; p-value | 0.28; 0.002** |
| Michigan Knowledge | Pearson’s correlation coefficient; p-value | 0.21; 0.019* |
| PHQ9 | Pearson’s correlation coefficient; p-value | -0.167; 0.068 |
| Construct validity | ||
| Age | Pearson’s correlation coefficient; p-value | -0.12; 0.173 |
| Gender | ANOVA; F test, df; p-value | F[1, 118] = 0.018; 0.893 |
| Level of education | ANOVA; F test, df; p-value | F[4,81] = 0.858;0.493 |
| Ethnicity | ANOVA; F test, df; p-value | F[9,110] = 1.23; 0.286 |
| Duration of diabetes | Pearson’s correlation coefficient; p-value | 0.11; 0.256 |
| Type of diabetes | ANOVA; F test, df; p-value | F [1, 108] = 5.433; 0.022* |
| A1C | Pearson’s correlation coefficient; p-value | -0.18;0.062; 104 participants |
*p < 0.05. ** p < 0.01. *** p < 0.001
a1 missing