. 2018 May 1;9:484. doi: 10.3389/fphys.2018.00484

Table 4.

Dependencies of loop-derived parameters in COPD patients.

	R_S	P	R_S	P	R_S	P
	A_ins cmH₂O⋅L⋅s^-1		A_exp cmH₂O⋅L⋅s^-1		ΔP_alv cmH₂O
R_ins, cmH₂O.L^-1.s	0.414	<0.001	0.493	<0.001	0.578	<0.001
R_exp, cmH₂O.L^-1.s	0.405	<0.001	0.627	<0.001	0.617	<0.001
FEV₁, L	-0.177	0.044	-0.341	<0.001	-0.347	<0.001
FVC, L	-0.230	0.008	-0.360	<0.001	-0.427	<0.001
FEV₁/FVC, %	-0.057	0.518	-0.143	0.105	-0.084	0.343
IC, L	-0.084	0.339	-0.194	0.027	-0.244	0.005
VC, L	-0.205	0.019	-0.279	0.001	-0.403	<0.001
TLC, L	-0.045	0.608	-0.041	0.640	-0.137	0.119
ITGV, L	-0.024	0.787	0.065	0.465	0.064	0.469
RV, L	0.053	0.549	0.145	0.100	-0.049	0.580
RV/TLC, %	0.175	0.047	0.321	<0.001	0.301	<0.001
Pa_CO2, mmHg	0.022	0.800	0.021	0.814	0.174	0.048
Pa_O2, mmHg	-0.040	0.650	-0.069	0.432	-0.073	0.408
6MWT, m	-0.193	0.028	-0.245	0.005	-0.285	0.001
Borg Score	0.138	0.117	0.202	0.021	0.117	0.185

A_ins: area of the inspiratory loop; A_exp: area of the expiratory loop; ΔP_alv: difference between end-expiratory and end-inspiratory alveolar pressure; FEV₁: forced expiratory volume in 1 s; FVC: forced vital capacity; IC: inspiratory capacity; VC: slow vital capacity; TLC: total lung capacity; ITGV: intrathoracic gas volume; RV: residual volume; V_A: alveolar volume by He dilution method; DL_CO: diffusion capacity for carbon monoxide; K_CO: transfer coefficient for carbon monoxide; 6MWT: 6 min walking test. Bold numbers indicate significant correlations.