Association between patient-reported outcomes and exercise test outcomes in patients with COPD before and after pulmonary rehabilitation

Table 2 Correlations between exercise test outcomes and PROs at baseline

	6MWD (m)	CPET (W_max)	CPET (VO_2peak)	CWRT (t)	TUG (t)	Q. Peak torque	Q. Total work
mMRC score	−0.65^*	−0.54^*	−0.40^*	−0.39^*	0.49^*	−0.32^*	−0.43^*
SGRQ-C total score	−0.53^*	−0.48^*	−0.31^*	−0.35^*	0.41^*	−0.26^*	−0.38^*
CAT total score	−0.37^*	−0.30^*	−0.21^*	−0.21^*	0.27^*	−0.23^*	−0.26^*
CCQ total score	−0.48^*	−0.43^*	−0.30^*	−0.29^*	0.34^*	−0.25^*	−0.34^*
HADS-A score	−0.25^*	−0.20^*	−0.10	−0.09	0.21^*	−0.16^*	−0.22^*
HADS-D score	−0.27^*	−0.22^*	−0.06	−0.08	0.26^*	−0.11	−0.20^*
CDS total score	0.50^*	0.40^*	0.25^*	0.24^*	−0.43^*	0.28^*	0.34^*

Correlations are reported as Pearson’s r or, in the case of ordinal and/or skewed variables or variables with significant outliers, as Spearman’s ρ; * p<0.001
Abbreviations: mMRC, modified Medical Research Council scale; SGRQ-C, COPD-specific St. George Respiratory Questionnaire; CAT, COPD Assessment Test; CCQ, Clinical COPD Questionnaire; HADS-A, Hospital Anxiety and Depression Scale, Anxiety subscale; HADS-D, Hospital Anxiety and Depression Scale, Depression subscale; CDS, Care Dependency Scale; 6MWD, 6-min walking distance; CPET, Cardiopulmonary Exercise Test; Wmax, maximal achieved workload; VO2peak, peak oxygen uptake; t, time; CWRT, Constant Work-Rate Test; TUG, Timed ‘Up and Go’ test; Q, Quadriceps muscle

ISSN: 1477-7525