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Table 2 Measurements of COPD based on the 2007 GOLD classification

From: Factors responsible for poor sleep quality in patients with chronic obstructive pulmonary disease

  GOLD Stage 1 GOLD Stage 2 GOLD Stage 3 GOLD Stage 4 P-value
N = 68 N = 161 N = 123 N = 25
MMRC, mean ± SD 1.50 ± 0.76 1.78 ± 0.75 1.96 ± 0.95 2.33 ± 1.09 <0.001
CAT, mean ± SD 9.15 ± 6.91 9.53 ± 6.35 11.07 ± 7.11 16.83 ± 8.29 <0.001
PSQI score, mean ± SD 6.54 ± 3.57 6.43 ± 3.50 6.33 ± 3.66 6.44 ± 3.16 0.970
PSQI >5, n (%) 36 (52.9) 85 (52.8) 64 (52.0) 15 (60.0) 0.910
  1. Abbreviations: CAT COPD assessment test, GOLD Global Initiative for Chronic Obstructive Lung Disease, mMRC modified Medical Research Council, PSQI, Pittsburgh Sleep Quality Index