|
6MWD (m)
|
CPET
(Wmax)
|
CPET (VO2peak)
|
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