Trends of Age at Menarche and Association with Body Mass Index in Chinese School-Aged Girls, 1985-2010

Song, Yi, Ma, Jun, Wang, Hai-Jun, Wang, Zhiqiang, Hu, Peijin, Zhang, Bing and Agardh, Anette (2014) Trends of Age at Menarche and Association with Body Mass Index in Chinese School-Aged Girls, 1985-2010. Journal of Pediatrics, 165 6: 1172-1177.e1. doi:10.1016/j.jpeds.2014.08.013


Author Song, Yi
Ma, Jun
Wang, Hai-Jun
Wang, Zhiqiang
Hu, Peijin
Zhang, Bing
Agardh, Anette
Title Trends of Age at Menarche and Association with Body Mass Index in Chinese School-Aged Girls, 1985-2010
Journal name Journal of Pediatrics   Check publisher's open access policy
ISSN 0022-3476
1097-6833
Publication date 2014-09-19
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jpeds.2014.08.013
Open Access Status DOI
Volume 165
Issue 6
Start page 1172
End page 1177.e1
Total pages 7
Place of publication Philadelphia, PA United States
Publisher Mosby, Inc.
Language eng
Subject 2735 Pediatrics, Perinatology, and Child Health
Abstract Objectives To estimate the shifts in age at menarche from 1985 to 2010, compare the differences of average age at menarche between urban and rural groups, and determine the association of menarche with body mass index (BMI).
Formatted abstract
Objectives
To estimate the shifts in age at menarche from 1985 to 2010, compare the differences of average age at menarche between urban and rural groups, and determine the association of menarche with body mass index (BMI).

Study design
The data were obtained from 4 cross-sectional Chinese National Surveys on Students' Constitution and Health (1985, 1995, 2005, and 2010). In this representative sample of Chinese school-aged girls, the average age at menarche was determined using probit analysis and compared between urban and rural areas. Logistic regression was used to assess the association of BMI with the likelihood of having reached menarche.

Results
The age at menarche in Chinese girls dropped from 13.41 years to 12.47 years from 1985 to 2010. There was a significant difference in age at menarche between urban and rural girls over time, with urban girls having their menarche earlier than rural girls. Logistic regression showed that a higher BMI was strongly associated with an increased likelihood of having reached menarche, even after controlling for age, urban or rural residence, province, social economic status, and school.

Conclusion
The analysis suggests a drop of about 4.5 months per decade in the average age at menarche over the past 25 years, and a significant inverse association between BMI and having reached menarche. Considering that both early menarche and higher BMI are significant risk factors for chronic diseases, and may act together in later years to the detriment of a woman's health, greater attention should be paid to the health of girls with earlier menarche and higher BMI.
Keyword Body Mass Index (BMI)
Chinese National Survey
Constitution and Health
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 81302442
APP1045000
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Medicine Publications
 
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Created: Wed, 24 Sep 2014, 07:38:30 EST by Zhiqiang Wang on behalf of Medicine - Royal Brisbane and Women's Hospital