NPPB and pulmonary arterial hypertension: The analysis again showed that ground-glass attenuation was associated with a seriously increased mortality rate independently of the BNP concentration (attenuation: p = 0.016, hazard ratio [95%CI] = 4.8 [1.3 - 16.9]; BNP: p < 0.001; hazard ratio [95%CI] = 2.7 [1.6 - 4.5]; the causes of PAH: p = 0.15).