The Role of Pulmonary Function Test for Pulmonary Arterial Hypertension in Patients with Connective Tissue Disease

Table 2

Comparisons of pulmonary function parameters among different risk groups.

Parameters	Low risk	Intermediate risk	High risk	value
FVC (%)				0.104
FEV1/FVC (%)				0.029
MEF50 (%)				0.021
TLC (%)				0.287
DLCO (%)				<0.001
FVC/DLCO				0.014

Bold values are statistically significant (). FVC: forced vital capacity; FEV1: forced expiratory volume in 1 second; MEF50: maximum expiratory flow at 50% of vital capacity; TLC: total lung capacity; DLCO: diffusing capacity of the lung for carbon monoxide.