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

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

   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
  1. Spearman’s ρ is reported since all exercise outcomes changes showed significant outliers; * p<0.001; # p < 0.01
  2. 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