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Table 4 Spearman’s correlation coefficient (rho) of spirometry and Pittsburgh Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS) (ESS) in the pre-rehabilitation period

From: Evaluation of sleep quality and daytime somnolence in patients with chronic obstructive pulmonary disease in pulmonary rehabilitation

 

FEV1 L/MIN

FVC L/MIN

FEV1FVC

FSa PSQI

−0.005

− 0.055

− 0.006

ESS

− 0.217

− 0.269

− 0.158

  1. FEV1 Forced expiratory volume in the first second, L liter, min minute, FVC forced vital capacity, FSa final score average, PSQI Pittsburgh index, ESS Epworth scale