Table 1. Characteristics of the patients.

	Controls (Reversible PAH, n = 23)	Irreversible PAH (n = 30)	Idiopathic PAH (n = 30)
Age (y)	2 (1–26)	6 (1–53)	7.5 (1–21)
Difference vs reversible PAH		0.02*	0,19
Difference vs irreversible PAH			0,36
Saturation (%)	96 (75–100)	92 (66–100)	97 (79–100)
Difference vs reversible PAH		0,1	0,52
Difference vs irreversible PAH			0.04*
Mean PAP	55 (20–70)	65 (25–98)	53 (27–88)
Difference vs reversible PAH		0.01*	0,34
Difference vs irreversible PAH			0,14

Data are expressed as medians and their range. Baseline characteristics were compared between the groups by using Wilcoxon’s rank sum test for none normally distributed variables (age) and Student’s unpaired test otherwise. Symbols: * p<5%.