Table 1.

Characteristics of reference and validation populations

Reference population (n = 1226)	Child volunteers	Normotensive volunteers	Hypertensive subjects	Patient group 1*	Patient group 2*
N	116	317	258	331	204
Age (median and range)	13 (5–17)	36 (18–73)	48 (18–84)	39 (18–77)	50 (18–81)
Gender (F/M)	59/57	168/149	138/120	193/138	121/83

Validation population (n = 3888)	Patients with phaeochromocytoma	Patients without phaeochromocytoma
N	558	3330
Age (median and range)	44 (6–89)	54 (4–96)
Gender (F/M)	(277/281)	(1960/1367)†

^*Group 1 represent patients tested because of an incidental mass found on imaging, an underlying germline mutation or a previous history of the tumour; patient group 2 represent patients tested because of signs and symptoms suggestive of phaeochromocytoma

^†For three patients there was no gender assignment