Subject Characteristics.^*

AE denotes acute exacerbation; FEV1 forced expiratory volume in 1 second; GOLD Global Initiative for Chronic Obstructive Lung Disease; 6MWT 6-minute walk test; MMRC Modified Medical Research Council; SGRQ-TS St. George's Respiratory Questionnaire Total Score; and SGRQ-AS St. George's Respiratory Questionnaire Activity Score. *Mean ± standard deviation for continuous variables and N (%) for categorical variables. +The median average daily step count is 5,232. †P Value<0.05; Unpaired T-test (continuous variables) or Fisher's Exact Test (categorical variables). ‡Information on medication was self-reported; subjects may have been taking more than one medication. §N = 168. ¶N = 83.