Sleep Disturbances in COPD are Associated with Heterogeneity of Airway Obstruction

Figures & data

Table 1. Functional characteristics of the study sample.

Variable	Mean (± SD)
BMI (Kg/m^2)	26.2 ± 4.7
FEV1 (% of predicted)	65.4 ± 25.3
FVC (% of predicted)	89.6 ± 23.4
FEV1/FVC (%)	54.3 ± 12.3
FEF25 (% of predicted)	46.8 ± 33
FEF50 (% of predicted)	37.7 ± 31
FEF75 (% of predicted)	38.4 ± 24
FEF25-75 (% of predicted)	23.18 ± 11.3
RV (% of predicted)	120 ± 41
RV/TLC (%)	115 ± 27
FRC/TLC (%)	114 ± 17
R5 (kPa s L^-1)	0.47 ± 0.16
R20 (kPa s L^-1)	0.32 ± 0.09
R5-R20 (kPa s L^-1)	0.20 ± 0.15
AX (kPas L^-1)	2.08 ± 1.76
RF (L/s)	22.5 ± 5.7
X5 (kPa s L^-1)	–0.19 ± 0.1
ESS (score)	4.3 ± 3.8

Abbreviations: BMI, Body Mass Index; FEV₁, Forced Expiratory Volume in 1 second; FVC, Forced Vital Capacity; FEF, Forced Expiratory Flow; RV, Residual Volume,; FRC, Functional Residual Capacity; TLC, Total, Lung Capacity; R, resistance; X, reactance; AX, Area of Reactance; RF, Resonant frequency; ESS, Epworth sleepiness scale.

Figure 1. Distribution of the CASIS score between the groups of low and high R5–R20 values.

Figure 2. Distribution of the resonant frequency between the groups of low and high R5–R20 values.