Table 2

Univariate correlates of baseline CAT score

VariableCorrelation coefficientNo. of observationsp Value
Age0.24296<0.001
FEV1 % predicted−0.172390.008
MRC dyspnoea score0.44252<0.001
HAD anxiety0.37215<0.001
HAD depression0.36215<0.001
CCQ0.6858<0.001
CRQ total−0.33297<0.001
SGRQ total0.7438<0.001
ISWT−0.36211<0.001
6MWT−0.27680.03
lnESWT−0.28380.084

  • CAT, COPD assessment test; CCQ, Clinical COPD Questionnaire; COPD, chronic obstructive pulmonary disease; CRQ, chronic respiratory questionnaire; FEV1 forced expiratory volume in 1 s; HAD, Hospital Anxiety and Depression score; ISWT, incremental shuttle walk test; lnESWT, log-transformed endurance shuttle walk test; MRC, Medical Research Council dyspnoea score; 6MWT, 6 min walk test; SGRQ, St George's Respiratory Questionnaire.