Pubertal changes in boys and girls in Newcastle upon Tyne

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Abstract
Boys [669] and 753 girls born in 1962 and living at home were observed at approximately 1/2 yearly intervals from 9-17 yr of age. Mean ages of reaching various developmental stages were calculated for voice change and facial hair in boys, menarche and breast development in girls, and for axillary hair in both sexes. Peak height velocity and age at which it occurred also were calculated for both sexes. Means were generally in good agreement with those found about 15 yr previously in the Harpenden Growth Study. Most pubertal changes in the present study showed gradients by social class; in boys, development was later in those with fathers in unskilled manual occupations; in girls the greatest differences, where found, were between those with fathers in non-manual occupations and the remainder.