Analysis on the age of menarche and associated factors of Han, Zhuang and Yao nationality female students in Guangxi

Objective To explore age of menarche and associated factors of Han nationality, Zhuang nationality and Yao nation ality girl in Guangxi, and to provide reference for the development of adolescent health education in schools. Methods The 7-, 10- and 13-year-old girls of Han, Zhuang, Yao nationality were chosed from three counties of Guangxi, and height, weight and other physical indicators were measured for three consecutive years, and age of menarche was inquired. 448 cases of with compete data in the three consecutive years of monitoring. The influencing factors were investigated through questionnaire. Results Age of menarche of the whole sample was 11.83 (95% CI = 11.69—11.96) years old, and that of the Han, Zhuang, Yao nationality was 11.87 (95% CI =11.64-12.09), 11.44(95% CI = 11.25-11.64) and 12.42(95% CI = 12.14-12.70)years old respectively, the difference was statistically significant ( P <0.05). Height, sitting height, weight of menarche group in 12 and 13 years old were significantly higher those of the group without menarche ( P <0.05) . Logistic regression analysis primary sitting height, the chest circumference, intake of seafood, duration of sleep in the night and school exercise time were the primary factors for age at menarche ( P <0.01). Conclusion There are ethnic differences in age of menarche among girls in Guangxi, and it is related to sleep, physical activity and dietary structure. Puberty recated health education for girls might start at the fourth grade of primary school, focusing on the education of health life patten, balanced dietary habits, regularly routine, with the goal of growth and development promotion. 【摘要】 目的 探索广西汉族、壮族、瑶族女生月经初潮年龄的影响因素, 为开展学校青春期健康教育工作提供参考依 据。 方法 运用序列研究法, 在广西 3 县分别抽取汉族、壮族、瑶族 7, 10, 13 岁女生, 连续 3 年进行身髙、体重等体格指标 的测量, 并询问月经来潮情况, 最终选取 3 年连续监测的相同有效样本 448 例。使用生长发育影响因素调査表进行调査。 结果 女生的月经初潮半数年龄为 11.83(95% CI = 11.69~11.96) 岁, 汉族、壮族、瑶族依次为11.87(95% CI = 11.64~12.09)、11.44 (95% CI =11.25~11.64) 和 12.42 岁 (95% CI = 12.14~12.70), 差异有统计学意义 ( P <0.05)。12, 13 岁组月经已 来潮女生的身髙、坐髙、体重等均髙于未来潮组, 差异均有统计学意义 ( P 值均<0.05) 。二分类 Logistic 回归分析显示, 月经 初潮年龄的影响因素主要为坐髙、胸围、海产品的摄人、夜间睡眠时长和在校运动时间 ( P 值均<0.01)。 结论 广西女生月 经初潮半数年龄有民族差异, 与运动情况和膳食结构有关。应在小学四年级开始进行女生青春期健康教育, 可侧重于健康 生活模式的教育, 培养学生均衡的膳食习惯和作息的规律, 促进学生的健康生长。