Pulmonary Hemodynamics and Six-Minute Walk Test Outcomes in Patients with Interstitial Lung Disease

Table 4

Results of stepwise multiple regression analysis for walk distance and SpO₂ and the Borg scale at end of 6 min walk test.

Variables	r	p
For walk distance
Weight	—	—
% FVC	0.37	0.01
% DLco	0.42	0.003
PaO2	—	—
PVR	—	—
For SpO2 at end of 6MWT
% DLco	0.31	0.001
PaO2	—	—
Mean PAP	—	—
PVR	−0.51	<0.0001
For the Borg scale at end of 6MWT
% DLco	−0.42	0.004
Mean PAP	—	—

The number of patients was 44 because 2 were excluded from the analysis due to absence of % DLco. is presented as a partial correlation coefficient. is presented only for variables which were selected as significant by the stepwise multiple regression analysis. Cumulative was 0.35 () for walk distance, 0.46 () for SpO₂ at end of 6MWT, and 0.18 () for the Borg scale at end of 6MWT, respectively.
% FVC: predicted forced vital capacity; % DLco: % predicted diffusing capacity of carbon monoxide; PaO₂: partial arterial pressure of oxygen; PAP: pulmonary artery pressure; PVR: pulmonary vascular resistance; SpO₂: transcutaneous oxygen saturation; 6MWT: 6 min walk test.