Abstract
Studies on growth at early adolescence in girls, with special reference to the, breast maturation, were presented. 483 girls aged 9 to 13, from a primary school in Mao, Ibaraki Prefecture, were examined three times at five months apart. The present paper is concerned with the developmental. stage of breast, which follow Reynolds & Wines (1948), shape and size of breast, age at menarche, growth of axillary hair, blood pressure and several anthropological measurements, including skinf old by Keys' spring caliper.The findings obtained were summarized as follows : The major factor, associated with the breast maturation were initial fat spurt as judged from the skinfold readings, time interval from the menarche and the chronological age in general. The, relationship between the developmental stage of breast and blood pressure increase were considered to have lesser significance than an association of the latter with the appearance of menarche.
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