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采用回顾性调查法先后于1982年和1991年6～8月间对图们市9～18岁朝鲜族和汉族女学生的月经初潮年龄进行调查。1982年调查2478人,1991年调查2217人。朝鲜族女生1982年初潮均龄为14.11岁,标准差为1.18岁;1991年均龄为12.86岁,标准差为1.28岁。10年间初潮龄均提前1.25年,(?)检验表明差异有显著性(P<0.01)。汉族女生月经初潮均龄,1982年为13.98±1.05岁,1991年为12.83±1.15岁,1991年提前了1.15年,差异也有显著性。
A retrospective investigation was conducted between 1982 and 1991, June to August in Tumen 9 to 18-year-old Korean and Han female students to investigate the age of menarche. In 1982 survey of 2478 people, 1991 survey of 2217 people. The average tidal age of Korean girls was 14.11 years old in 1982 with a standard deviation of 1.18 years. In 1991, the mean age was 12.86 years with a standard deviation of 1.28 years. In the 10 years, the ebb tide was 1.25 years earlier than that of the control group (P <0.01). The average age of menarche of Han girls was 13.98 ± 1.05 years in 1982, 12.83 ± 1.15 years in 1991 and 1.15 years in advance in 1991, the difference was also significant.