Table 1. Patient characteristics in the National Institutes of Health (NIH), French and REVEAL registries

Parameter	NIH [10]	French [1]	REVEAL [2]	CompERA [9]
Year	1981–1985	2002–2003	2006–2007	2007–2009 (data collection ongoing)
Country	USA	France	USA	6 EU countries: Germany, UK, Belgium, Netherlands, Italy and Ireland
Inclusion criteria	PPH	PAH	PAH	Newly initiated on PAH therapy (PAH 74%; PH 26%)
Patients	187	674	2716	1008
Age yrs	36±15	50±15	50±17	64
Time since diagnosis months	24.4	27	39	Not given
WHO-FC %
II	29	24	37.8	9
III/IV	71	75	53.7	91

Data are presented as n or mean±sd, unless otherwise stated. REVEAL: Registry to Evaluate Early and Long-Term Pulmonary Arterial Hypertension Disease Management; WHO-FC: World Health Organization-functional class; PPH: primary pulmonary hypertension (PH); PAH: pulmonary arterial hypertension; EU: European Union.