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Table 3 Measurements of COPD based on 2011 GOLD classification

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

  GOLD group A GOLD group B GOLD group C GOLD group D P-value
N = 60 N = 150 N = 34 N = 133
MMRC, mean ± SD 0.87 ± 0.34 2.05 ± 0.58 0.72 ± 0.46 2.31 ± 0.81 <0.001
CAT, mean ± SD 4.52 ± 2.14 11.09 ± 6.75 4.74 ± 2.69 13.84 ± 7.08 <0.001
PSQI score, Mean ± SD 5.63 ± 2.92 6.67 ± 3.68 5.03 ± 3.29 6.85 ± 3.57 0.008
PSQI >5, n (%) 26 (43.3 %) 81 (54.0 %) 13 (38.2 %) 80 (60.2 %) 0.046
  1. Abbreviations: CAT COPD assessment test, GOLD Global Initiative for Chronic Obstructive Lung Disease, mMRC modified Medical Research Council, PSQI Pittsburgh Sleep Quality Index