Validation and clinical interpretation of the St George’s respiratory questionnaire for COPD (SGRQ-C) after adaptation to Malaysian language and culture, in patients with COPD

Table 4 Results of correlation between baseline SGRQ-CM scores and other clinical and health status measures

	Symptom	Activity	Impact	Total
FEV₁/FVC	−0.35	−0.46	−0.42	−0.46
FEV₁%predicted	−0.31	− 0.42	− 0.40	− 0.42
CAT	0.79	0.76	0.87	0.86
EQ-5D-5 L UI	−0.71	− 0.74	− 0.80	−0.82
EQ-VAS	−0.53	−0.59	− 0.56	−0.61
mMRC Dyspnea	0.64	0.79	0.63	0.72

Results from Pearson correlation Coefficient test; Correlation is significant at the 0.05 level (2-tailed); High % Predicted FEV1 and EQ-5D-5 L score indicate better quality of life; CAT COPD assessment test; EQ-5D-5 L UI, European Quality of life 5-Dimension 5-Level questionnaire Utility index score; EQ-VAS, European Quality of life 5-Dimension 5-Level questionnaire Visual analogue score; FEV₁, forced expiratory volume in one second; FVC, Forced vital capacity; FEV₁ (%), percentage predicted FEV₁; mMRC modified medical research council dyspnea scale; spirometric data were post-bronchodilator

ISSN: 1477-7525