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

Table 3 Correlations between changes in exercise test outcomes and changes in PROs (pre vs. post PR)

		Δ6MWD (m)	ΔCWRT (t)	ΔTUG (t)	Δ Q. Peak torque	Δ Q. Total work
ΔmMRC score	ρ	−0.24^*	−0.08	0.19^#	−0.08	−0.15
ΔSGRQ-C total score	ρ	−0.28^*	−0.29^*	0.11	−0.03	−0.10
ΔCAT total score	ρ	−0.21^*	−0.24^*	0.06	0.03	−0.08
ΔCCQ total score	ρ	−0.36^*	−0.33^*	0.15^#	−0.03	−0.16^#
ΔHADS-A score	ρ	−0.19^*	−0.17^#	0.12	−0.04	−0.07
ΔHADS-D score	ρ	−0.15^#	−0.21^*	0.16^#	0.01	−0.08

Spearman’s ρ is reported since all exercise outcomes changes showed significant outliers; * p<0.001; ^# p < 0.01
Abbreviations: mMRC, modified Medical Research Council scale; SGRQ-C, COPD-specific St. George Respiratory Questionnaire score; 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; 6MWD, 6-min walking distance; t, time; CWRT, Constant Work-Rate Test; TUG, Timed ‘Up and Go’ test; Q Quadriceps muscle

ISSN: 1477-7525