Table 1. Clinical characteristics of child- vs adult-onset PAH cases at diagnosis.

Data from the National Biological Sample and Data Repository for PAH (n=2572 cases) (Zhu et al 2019 #8). Child-onset, <18 years of age at diagnosis. MPAP, mean pulmonary artery pressure; CO, cardiac output; PVR, pulmonary vascular resistance; dx, diagnosis.

Group	Age at dx (y)	MPAP (mmHg)	CO, Fick (L/min)	PVR (Woods units)
Child (n=226)	8 ± 6 (226)	55 ± 18 (225)	3.3 ± 1.6 (168)	17.7 ± 11.6 (164)
Adult (n=2345)	52 ± 19 (2345)	50 ± 14 (2293)	4.6 ± 1.7 (1630)	10.0 ± 5.9 (1579)
P-value	<0.0001	<0.0001	<0.0001	<0.0001