Objective To conduct a cross-sectional study on pubertal development of students aged 6 to 16 years in Shenzhen,in order to provide basic data for children health care and health education. Methods Two primary schools and two middle schools were randomly selected from three districts of Shenzhen,and finally 10 674 children aged 6 to 16 years were enrolled in this study.Data of secondary sexual development(testicular and pubic hair development in boys, breast and pubic hair development in girls) were obtained by the status quo method, and the age of menarche was inquired.Probit regression model was used for statistical analysis, and the results were expressed by median age and the corresponding 95% confidence interval. Results The age of onset of Tanner stages 2 for testicular and pubic hair for boys were 10.1(10.0-10.2) years old and 12.2 (11.9-12.6) years old, respectively.The age of onset of breast development and pubic hair for girls was 8.5(7.4-9.4) years old and 10.6 (10.5-10.7) years old, respectively.The age of menarche for girls was 12.1(11.8-12.4) years old.Compared with the data of study in urban Chinese children in 2005, the onset age of puberty was 0.4 years earlier for boys and 0.7 years earlier for girls, and the age of menarche was 0.1 years earlier for girls. Conclusions The onset age of puberty and the age of menarche in students aged 6 to 16 years in Shenzhen are similar to the results of the pubertal study in 2005.
Key words
puberty /
breast development /
menarche /
cross-sectional study
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