ne subject failed to return the baseline accelerometer and was removed from analysis. Characteristics of the 79 subjects comprising the baseline analysis of weight status are displayed in Table 1. The sample was predominantly female (83.5%), most participants reported being graduates of high school, and all reported having OA in at least one other location in the body beyond the knee(s). Approximately 32% were of minority racial background. Subjects were classified in five groups according to BMI: normal weight (); overweight (); obesity class I (); obesity class II (); or obesity class III ().