*3.2. Reward Sensitivity*

With respect to the BAS total score and the fun seeking and reward responsiveness subscales, the ED, healthy controls, and obesity groups did not differ significantly from each other. However, on the BAS drive subscale (Figure 2), patients with Class III obesity with and without binge eating scored significantly higher on drive compared to patients with AN-BP, BN, and healthy controls. Patients with Class III obesity and binge eating also scored higher on the BAS drive subscale than patients with AN-R. There were no significant differences between patients with Class II and Class III obesity.

**Figure 2.** Means (standard errors) of the behavioral activation scale—drive scores for eating disorders, healthy controls, and obesity groups, controlled for age.
