Table 2.

Hierarchical multiple regression model increases in coefficient of determination results for age and BMI (Model 1), with GWI Health Status (Model 2), and with DTS Total Score (Model 3)

Measure	Model 1	Model 2	Model 3
	Δ R2	Δ R2	Δ R2
Physical functioning	0.112*	0.250**	0.167**
Physical rolea	0.071	0.435**	0.085**
General health perceptions	0.095**	0.436**	0.091**
Energy/fatigue (Vitality)	0.122**	0.418**	0.154**
Social functioning	0.125**	0.327**	0.218**
Emotional roleb	0.059	0.359**	0.248**
Emotional well-being	0.073*	0.425**	0.181**
Pain	0.111**	0.338**	0.164**
Physical fatigue	0.106**	0.418**	0.066**
Mental fatigue	0.081*	0.439**	0.055**
Reduced activity	0.155**	0.354**	0.316**
Reduced motivation	0.062*	0.343**	0.131**
General fatigue	0.111**	0.448**	0.131**

*p < 0.05; **p < 0.01

^aPhysical Role (Role Limitations due to Physical Health)

^bEmotional Role (Role Limitations due to Emotional Problems)