Canadian Respiratory Journal

Research Article

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

Table 3

Pearson correlation coefficients between 6 min walk test outcomes and various parameters.


Variables	Walk distance		SpO₂ at the end of 6MWT		Borg scale at the end of 6MWT
Variables	r	p	r	p	r	p

Age	−0.20	0.19	−0.27	0.07	0.06	0.68
Height	0.23	0.12	0.16	0.29	−0.10	0.51
Weight	0.31	0.04	−0.10	0.51	−0.03	0.84
BMI	0.26	0.08	−0.27	0.07	0.05	0.76
FVC	0.49	0.0005	0.12	0.44	−0.23	0.12
% FVC	0.39	0.007	−0.04	0.80	−0.22	0.14
DLco	0.61	<0.0001	0.47	0.001	−0.38	0.01
% DLco	0.46	0.002	0.49	0.0007	−0.42	0.004
PaO₂	0.43	0.002	0.43	0.003	−0.30	0.04
PaCO₂	0.17	0.27	−0.09	0.56	−0.12	0.47
Mean AP	−0.01	0.95	0.02	0.90	0.08	0.60
RAP	0.10	0.52	0.26	0.09	−0.04	0.79
Mean PAP	−0.27	0.07	−0.50	0.0003	0.32	0.03
PCWP	0.004	0.98	0.01	0.94	−0.02	0.90
CO	−0.05	0.76	0.16	0.29	0.14	0.36
Cardiac index	−0.13	0.65	0.10	0.52	0.17	0.26
PVR	−0.33	0.02	−0.63	<0.0001	0.24	0.12

The number of patients was 46 except for DLco, which numbered 44.
BMI: body mass index; FVC: forced vital capacity; % FVC: % predicted FVC; DLco: diffusing capacity of carbon monoxide; % DLco: % predicted DLco; PaO₂: partial arterial pressure of oxygen; PaCO₂: partial arterial pressure of carbon dioxide; AP: systemic arterial pressure; RAP: right arterial pressure; PAP: pulmonary artery pressure; PCWP: pulmonary capillary wedge pressure; CO: cardiac output; PVR: pulmonary vascular resistance; SpO₂: transcutaneous oxygen saturation; 6MWT: 6 min walk test.