Figure 3.

Structural equation model depicting the relationship between predictor variables (change in HbA_1c and change in weight) and the latent construct (change in quality of life [QOL]) from baseline to 1 year for all subjects in the study. Change in quality of life is measured by changes in patient responses to the IWQOL, PAID, and SF-36 instruments. Numbers represent standardized β-coefficients; ε1–ε4 represent error terms from the model. Negative β-coefficients indicate that a decrease in the measurement or score (weight, HbA_1c, IWQOL, and PAID) was associated with improved quality of life.