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Table 4 Psychometric properties of LMC SCPI index for 25 items

From: The LMC Skills, Confidence & Preparedness Index (SCPI): development and evaluation of a novel tool for assessing self-management in patients with diabetes

  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
  1. *p < 0.05. ** p < 0.01. *** p < 0.001
  2. a1 missing