Trends of age of menarche among Chinese Han girls aged 9 to 18 years from 2010 to 2019.

Ning MA; Di Shi; Shan Cai; Jia Jia Dang; Pan Liang Zhong; Yun Fei Liu; Jing LI; Yan Hui Dong; Pei Jin HU; Bin Dong; Tian Jiao Chen; Yi Song; Jun MA

Return

Trends of age of menarche among Chinese Han girls aged 9 to 18 years from 2010 to 2019.

Author: Ning MA ¹ ; Di SHI ¹ ; Shan CAI ¹ ; Jia Jia DANG ¹ ; Pan Liang ZHONG ¹ ; Yun Fei LIU ¹ ; Jing LI ¹ ; Yan Hui DONG ¹ ; Pei Jin HU ¹ ; Bin DONG ¹ ; Tian Jiao CHEN ¹ ; Yi SONG ¹ ; Jun MA ¹
Author Information

1. Institute of Child and Adolescent Health/School of Public Health, Peking University, Beijing, 100191.
Publication Type:Journal Article
From: Chinese Journal of Preventive Medicine 2023;57():36-41
CountryChina
Language:Chinese
Abstract: Objective: To analyze the trends of the age of menarche among Chinese Han girls aged 9 to 18 years from 2010 to 2019. Methods: Data were extracted from the Chinese National Surveys on Students' Constitution and Health in 2010, 2014 and 2019. A total of 253 037 Han girls aged 9 to 18 years with complete data on menarche were selected in this study. They were asked one-on-one about their menstrual status, age and residence information. The median age of menarche was estimated by probability regression. U tests were used to compare the difference in median age at menarche in different years. Results: The median age at menarche (95%CI) among Chinese Han girls was 12.47 (12.09-12.83) years in 2010, 12.17 (11.95-12.38) years in 2014 and 12.05 (10.82-13.08) years in 2019, respectively. Compared with that in 2010, the median age at menarche in 2019 decreased by 0.42 years (U=-77.27, P<0.001). The annual average changes were-0.076 years from 2010 to 2014 (U=-57.19, P<0.001) and-0.023 years from 2014 to 2019 (U=-21.41, P<0.001), respectively. The average annual changes in urban areas in the periods of 2010 to 2014 and 2014 to 2019 were-0.071 years and 0.006 years, respectively, while those in rural areas were-0.082 years and-0.053 years, respectively. The average annual changes in the regions of north, northeast, east, south central, southwest and northwest were-0.064, -0.099, -0.091, -0.080, -0.096 and-0.041 years in the period of 2010 to 2014 and 0.001, -0.040, -0.002, -0.005, -0.043 and-0.081 years in the period of 2014 to 2019. Conclusion: The age of menarche among Chinese Han girls aged 9 to 18 years shows an advanced trend from 2010 to 2019, and the trends in urban and rural areas and different regions have different characteristics.