【摘要】 作者调查了1063例农村儿童性发育,结果表明:女性性发育以乳房发育开始,高峰年龄为11岁,继之是阴毛和腋毛发育,月经初期年龄为13岁。男性性发育以睾丸增大开始,继之为阴毛、腋毛和面毛发育,首次遗精年龄以15岁最多。作者进一步研究了它们之间的关系。更多还原

【Abstract】 An investigation on the sexual develop-ment of 1063 children from 7 to 15 years inrural areas of Deyang County is reported.Among them 546 were female and 517 male.In the females the earliest secondary sexualcharacteristics were breast budding appear-ing at a mean age of 11 years, pubic hairand axillary hair at 12 and 13 years respec-tively,and menarche at 13 years. In malesthe earliest signs of sexual developmentwere enlargement of testes occurring at theage of 10 years and accelerating at the ageof 12 to 13, the mean size of testes at theage of 13 and 15,11.1 ml and 15.1 ml respec-tively. The development of external genitalorgan occurred in 55.9% of children at 12years. The earliest secondary sexual charac-teristics were the appearance of pubic hairoccurring at 13, axillary and facial hair,voice change and Adam’s apple enlargementat 14, 14 to 15 years, respectively. The be-ginning of ejaculation was noted in 23.5%of the boys at 13 years, in 39.5% at 15 years.Male breast development was discovered in19.7% of boys (102 out of 517). Adolescent goiter was detected in 82 chil-dren (7.71%) of whom 13.2% were femaleand 1.9% male. Undescended testes weredetected in 20 boys (7.9%) of whom 12 boyshad lateral undescended testes and 8 boyshad bilateral undescended testes.更多还原