Figure 1. Structural equation model for longitudinal analysis of body mass index (BMI) changes: standardized estimates. Black dotted line depicts the covariance parameters between Global Assessment of Functioning (GAF), duration of illness, and intervention. E1-E5 indicate the measurement errors. The categorical variables gender and intervention refer to the male and Superwellness groups respectively. The number of different parameters to be estimated was 22, including covariance parameters for improving the model fit. *p < 0.05; ^† p < 0.001.