NPPB and pulmonary arterial hypertension: Comparing the PAH and no PH groups, PAH was associated with a significantly higher mean ± SD NT-proBNP (1,074 ± 1,506 versus 303 ± 461, P = 0.008) and FVC/DLCOcorr ratio (2.1 ± 0.5 versus 1.45 ± 0.4, P = 0.0001).