Table 1.

Relative rate (%) of MBS in the five Italian regions

	No. of cases (N)	Age range at diagnosis (years)	No. of males (M)	% Males	No. of females (F)	% Females
Northeast	35	0*–38	16	45.7	19	54.3
Northwest	51	0*–55	19	37.3	32	62.7
Central	34	0*–49	16	47.1	18	52.9
South	29	0*–34	15	51.7	14	48.3
Islands	15	0*–18	7	46.7	8	53.3
Total	164	0*–55	73	44.5	91	55.5

0* means that the diagnosis was made within the first year of life in newborns