The mean age at menarche in 6252 girls from secondary schools in six areas of the Veneto (Northern Italy) in 1975-1976, was estimated by probit analysis as 12-77 +/- 0-038 years. This mean is the highest known for Italy. Sexual maturation appears late in girls from large families and early in girls from small families: mean menarcheal ages were respectively 12-81 +/- 0-057 and 12-64 +/- 0-036 years.
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Pia Grassivaro Gallo (1977) studied this question.