An investigation of sex development of healthy youngsters in Yimeng mountain area
Abstract：Objective To find out the present situation of sex development of youngsters in Yimeng mountain area and provide valuable data for making a plan about sex education and setting up a diagnostic standard of abnormal sex development. Methods An investigation of sex development of 1735 youngsters was carried out in Yimeng mountain area. The height, body weight, the age of first emission or menarche and the secondary sex characteristics were investigated. The length and width of the testicles, the length and diameter of penis were measured with vernier calliper for 876 male youngsters. The puberty has been divided into 3 periods with sexual development index(D.I). Results The puberty in male commenced at about the age of 13 and female at about 11;The average age of first emission in male youngsters was 15.23 and the menarche in female was 13.38;The peak of height velocity(PHV) occured at the age of 14 in males and 12 in females,The peak of weight velocity(PWV) was at the age of 15 in males and 13 in females;The development of pubic hair was earlier than that of breast in 13.96% females. Conclusion The investigation shows that youngsters in Yimeng mountain area lack sex knowledge, receive less sex education and delay in sex development. The investigation has also provided valuable medical data which might be of help to researches on sex education about youngsters in mountain area.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 154-156 )