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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