TABLE 3

Pearson correlation coefficients for the 1-min sit-to-stand (STS) test with other exercise capacity tests, muscle strength test and patient-reported outcomes at admission, discharge and change scores#

STAND-UPRIMTCORE
BaselineFollow-upChangeBaselineFollow-upChange
Subjects n524848200191188
6MWT0.590.67−0.080.640.680.21
5STS−0.59−0.70−0.27
QMVC+0.430.490.24
CRQ
 Dyspnoea0.270.520.15
 Fatigue−0.010.330.17
 Emotional0.070.380.11
 Mastery0.090.280.18
CAT−0.20−0.33−0.25−0.30−0.30−0.14
HADS depression−0.13−0.29−0.20
HADS anxiety−0.03−0.30−0.22
Feeling thermometer0.120.380.35
BDI/TDI§0.510.350.43−0.12
SGRQ
 Symptoms−0.18−0.27−0.11
 Activity−0.48−0.44−0.12
 Impacts−0.32−0.34−0.19
 Total−0.38−0.42−0.21
CCQ
 Symptoms−0.14−0.18−0.13
 Functional−0.41−0.37−0.05
 Mental−0.16−0.21−0.05
 Total−0.30−0.31−0.11
MRC−0.39−0.42−0.06
  • 6MWT: 6-min walk test; 5STS: five-repetition sit-to-stand test; QMVC: quadriceps maximal voluntary contraction; CRQ: Chronic Respiratory Questionnaire; CAT: COPD (chronic obstructive pulmonary disease) Assessment Test; HADS: Hospital Anxiety and Depression scale; BDI/TDI: Baseline and Transition Dyspnoea Indexes; SGRQ: St George's Respiratory Questionnaire; CCQ: Clinical COPD Questionnaire; MRC: Medical Research Council dyspnoea scale. #: a priori assumption that correlations would be strong (≥0.6) for exercise capacity tests (6MWT and 5STS), moderate (0.4–0.6) for muscle strength and dyspnoea (QMVC, BDI/TDI and MRC) and weak (<0.4) for health-related quality of life (CRQ, CAT, HADS, feeling thermometer, SGRQ and CCQ). Correlation coefficients are presented in bold when they met our assumptions and normal font when they were higher or lower than expected. : for RIMTCORE, the higher score of two tests was used; +: n=30 (only conducted in one pulmonary rehabilitation clinic); §: BDI: baseline score, TDI: change score.