TABLE 2

Spearman correlation coefficients in chronic obstructive pulmonary disease patients

p22phoxmPAPBMIDLCOFEV1LTOTPCO2PO2PO2/FIO2
ρp-valueρp-valueρp-valueρp-valueρp-valueρp-valueρp-valueρp-value
p22phox10.400.025−0.070.69−0.580.0007−0.030.89−0.350.05−0.020.900.330.060.410.02
mPAP10.160.38−0.600.00030.130.470.050.780.050.770.250.170.080.65
BMI1−0.0040.970.270.140.170.33−0.150.400.220.230.100.58
DLCO10.090.620.170.34−0.160.38−0.090.59−0.120.48
FEV110.300.09−0.430.01−0.060.71−0.250.16
LTOT1−0.220.230.020.9−0.67<0.0001
PCO21−0.060.740.130.47
PO210.66<0.0001
PO2/FIO21

mPAP: mean pulmonary arterial pressure; BMI: body mass index; DLCO: diffusing capacity of the lung for carbon monoxide; FEV1: forced expiratory volume in 1 s; LTOT: long-term oxygen therapy; PCO2: carbon dioxide tension; PO2: oxygen tension; FIO2: inspiratory oxygen fraction.