Changes in Theory-Based Psychological Factors Predict Weight Loss in Women with Class III Obesity Initiating Supported Exercise

Table 1

Results of simultaneous multiple regression analyses for prediction of BMI change over 24 weeks.

Measure	$\beta$	$R^2$	$R_{\text{adj}}^2$	F	P
Model 1		0.293	0.232	4.777	.003
Δ Total Mood Disturbance	0.367				.046
Δ Exercise Barriers Self-Efficacy	−0.096				.514
Δ Physical Self-Concept	−0.065				.681
Δ Body Areas Satisfaction	−0.141				.417
Model 2		0.347	0.274	4.780	.001
Δ Total Mood Disturbance	0.398				.028
Δ Exercise Barriers Self-Efficacy	0.000				.999
Δ Physical Self-Concept	−0.047				.749
Δ Body Areas Satisfaction	−0.048				.782
Exercise session attendance	−0.263				.061

The Delta symbol (Δ) denotes change from baseline to Week 24.
Adjusted $R^2(R_{\text{adj}}^2)=1-(1-R^2)(N-1)/(N-k-1$), where $k$ denotes number of predictors in the model. This allows comparison of multiple models with a different number of predictors.