[The survey of puberty timing in healthy boys in Daqing city in northern China].
OBJECTIVE
To investigate the puberty timing in healthy adolescent boys in Daqing city in northern China.


METHODS
A cross-sectional and longitudinal combined survey was performed. On 150 male students aged 6-15. Follow up was conducted for 4 years. The serum levels of luteinizing hormone (LH), Follicular Stimulating Hormone (FSH) and total testosterone (TT) were measured. The puberty timing and anthropometry including the body height, weight, and genital development according to Tanner's stages were all recorded.


RESULTS
The mean age of puberty onset in healthy adolescent boys is (12.0+/-1.6) years. The growth velocity in the first year after puberty onset is (6.9+/-0.4) cm/year. The level of plasma TT at the time of puberty onset is (1.0+/-0.3) nmol/L.


CONCLUSIONS
The puberty timing of boys in the Daqing city, northern China is in the range from 8 to 14 years.
Wu
Xue-yan
XY
Peking Union Medical College Hospital, CAMS&PUMC, Beijing 100730, China.
Shi
Yi-fan
YF
Deng
Jie-ying
JY
Pan
Hui
H
Lu
Shuang-yu
SY
Jiang
Ya-yun
YY
Wu
Qin-yong
QY
Zhang
Jing-ling
JL
D000293:Adolescent; D000886:Anthropometry; D002648:Child; D002681:China; D002909:Chronobiology Phenomena; D003430:Cross-Sectional Studies; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D008137:Longitudinal Studies; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D011627:Puberty / Q000097:blood* / Q000502:physiology*; D011629:Puberty, Precocious / Q000097:blood / Q000503:physiopathology; D013739:Testosterone / Q000097:blood; D013997:Time Factors
D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone