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Geographic distribution and secular trend of menarche in 9-18 year-old Chinese Han girls
Ist Teil von
Beijing da xue xue bao. Journal of Peking University. Yi xue ban, 2011-06, Vol.43 (3), p.360
Ort / Verlag
China
Erscheinungsjahr
2011
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
To analyze the characteristics and secular trend of age at menarche (age at menarche, AAM) in Chinese girls aged 9-18.
Probit analyses were used to calculate AAMs in various populations of Chinese girls who participated in National Physical Fitness and Health Surveillance in 2005 or 1995. The samples of girls were 92 767 in 2005 and 85 433 in 1995 National Physical Fitness and Health Surveillance, respectively.
AAM was 12.76 years in Chinese girls aged 9-18 in China. AAMs were 12.60 and 12.92 years for urban and rural girls, respectively. There was a large variation among different geographic areas, and AAM was earlier in girls living in east of China and later in girls living in northwest of China. AAMs of the top 5 municipalities/provinces were Beijing (12.27 years), Shanghai (12.32 years), Sichuan (12.48 years), Fujian (12.50 years) and Tianjin (12.51 years); and the last 5 provinces/autonomous regions were Qinghai (14.09 years), Hubei (13.33 years), Heilongjiang (13.10 years), Ningxia (13.08 years) and Hu