The structural equation model, with parameter estimates, examining the structural relations
among the self-determination theory model of health behavior, quality of life, medication
adherence, and physiological outcomes among patients with diabetes.
Notes. Latent variables were used to represent Medication Adherence and Glycemic Control,
and the path coefficients are standardized estimates. Each squared multiple correlation (R2)
value represents the proportion of variance in an endogenous variable that is explained by the
predictors of that particular endogenous variable. The covariances (specified in the text)
between the residual variances were omitted from the figure for clarity. DP = Pharmacy-report
anti-diabetic medication, CP = Pharmacy-report lipid-lowering medication, DS = Self-report
anti-diabetic medication, CS = Self-report lipid-lowering medication, HbA1c = glycosylated
hemoglobin. ***p < .001
Williams et al. Page 10
Diabetes