“…Because of the tertiary nature of the clinic, primary care records were not available, requiring collection of comorbidity data by self-report to ensure complete data collection. Hence, medical comorbidities were obtained by utilizing yes/no questions designed and successfully used in a prior pilot study by the principal investigator among chronic disease internal medicine patients [24]. The following comorbidities, which have the potential to influence physical activity, were assessed: lung disease (including home oxygen), heart disease (congestive heart failure or coronary artery disease), peripheral vascular disease, renal dialysis, and arthritis.…”