Univariate Associations with Number of Acute Exacerbations and COPD-Related Hospitalizations.

6MWT denotes 6-minute walk test; SGRQ-AS St. George's Respiratory Questionnaire Activity Score; FEV1 forced expiratory volume in 1 second; AE acute exacerbation; SGRQ-TS St. George's Respiratory Questionnaire Total Score; MMRC Modified Medical Research Council; and ref reference group. §Rate ratios calculated for a MCID of 30 m [37] for 6MWT and 4 units [42] for SGRQ-AS. The regression coefficients (SE) in natural log risk per 30-m decrease in 6MWT predicting AEs and COPD-related hospitalizations are 0.0976 (0.0323) and 0.1946 (0.0516), respectively. The regression coefficients (SE) in natural log risk per 4-unit decrease in SGRQ-AS predicting AEs and COPD-related hospitalizations are 0.0712 (0.0206) and 0.1091 (0.0347), respectively. †N = 168.