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Table 4 Sleep component scores based on the PSQI in patients with COPD

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

Components Mean ± SD
Sleep quality 0.97 ± 0.75
Sleep latency 1.16 ± 1.09
Sleep duration 1.11 ± 0.94
Sleep efficiency 0.73 ± 1.04
Sleep disturbance 1.50 ± 0.59
Use of sleeping medication 0.47 ± 1.03
Daytime dysfunction 0.48 ± 0.66
  1. Abbreviation: PSQI Pittsburgh Sleep Quality Index