Table 3.

FOT values of enrolled subjects with COPD.

	Hypercapnia	Normocapnia	p Value
	(n = 22)	(n = 102)
R5, cmH2O/L/s
Whole breath	5.05 (3.58–6.43)	3.50 (2.72–4.32)	0.001
Inspiratory	5.56 (3.62–7.75)	3.91 (3.00–5.02)	0.004
Exspiratory	4.32 (3.28–5.07)	3.09 (2.34–3.83)	0.005
delta R5	1.17 (0.25–2.07)	0.77 (0.47–1.29)	0.001
R20, cmH2O/L/s
Whole breath	2.78 (2.01–3.77)	2.56 (2.21–3.31)	0.891
Inspiratory	−1.47 (−3.45–0.22)	2.87 (2.33–3.62)	<0.001
Exspiratory	3.94 (1.87–7.51)	2.34 (1.90–3.06)	0.009
delta R20	−5.46 (−11.25–−0.21)	0.41 (0.22–0.75)	<0.001
R5–R20, cmH2O/L/s
Whole breath	9.29 (2.54–18.76)	0.80 (0.53–1.19)	<0.001
Inspiratory	−14.75 (−30.01–−1.01)	1.00 (0.66–1.47)	<0.001
Exspiratory	24.04 (3.71–48.77)	0.57 (0.34–0.89)	<0.001
delta (R5-R20)	−38.78 (−78.77–−2.98)	0.38 (0.18–0.58)	<0.001
X5, cmH2O/L/s
Whole breath	−2.66 (−4.51–−1.12)	−0.74 (−1.90–−0.37)	<0.001
Inspiratory	−3.34 (−5.26–−1.09)	−0.78 (−2.41–−0.35)	<0.001
Exspiratory	−1.96 (−3.01–−1.16)	−0.74 (−1.34–−0.39)	<0.001
delta X5	−0.79 (−2.29–0.09)	−0.09 (−0.96–0.18)	0.108
Fres, Hz
Whole breath	19.03 (11.99–22.57)	9.90 (7.44–15.05)	<0.001
Inspiratory	20.87 (12.16–23.89)	10.47 (7.46–16.73)	<0.001
Exspiratory	16.76 (11.66–22.18)	9.81 (7.34–13.04)	<0.001
delta Fres	2.34 (0.89–4.35)	1.18 (−0.62–4.14)	0.431
ALX, cmH2O/L/s Hz
Whole breath	22.70 (5.17–36.94)	2.91 (1.24–12.16)	<0.001
Inspiratory	29.53 (5.20–47.61)	2.98 (1.12–16.00)	<0.001
Exspiratory	14.31 (5.75–23.49)	2.92 (1.28–7.25)	<0.001
delta ALX	7.76 (0.81–18.79)	0.74 (−0.47–7.24)	0.059