Table 1.

Prevalence of Behçet's syndrome and frequency of HLA-B∗51 in various countries

	Prevalence	HLA-B∗51 (%)
	(/100 000)	Patients with Behçet's syndrome	Control
Japan	7.0–14.6	58.9	13.8
Iran	16.7–80.0	61.9	28.7
Saudi-Arabia	19.5	76.9	22.2
Turkey	80.0–421.0	75.0	24.7
Italy	3.8	57.4	19.2
Spain	5.6–7.5	36.2	19.6
German	0.6–1.47	57.6	12.3