Do We Need Exercise Tests to Detect Gas Exchange Impairment in Fibrotic Idiopathic Interstitial Pneumonias?

Table 3

Correlation between percent-predicted DLco and other measures.

Variable	coefficient	P value
FVC	0.56	<0.0001
TLC	0.437	<0.0001
FEV1	0.508	<0.0001
Kco	0.56	<0.0001
Resting PaO2	0.525	<0.0001
P(A-a)O2, peak (mmHg)	−0.465	<0.0001
ΔP(A-a)O2/ ΔVO2 (mmHg/L)	−0.534	<0.0001
6MWT, nadir SpO2 (%)	0.511	<0.0001
6MWT, ΔSpO2 (%)	−0.47	<0.0001
VD/VT, peak	−0.404	<0.0001