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月经初期是反映女性发育和性成熟的重要指标，为了解黔西北地区女性月经初期年龄的状况，我们采用现状调查法对本区7～18岁城乡汉族女学生1628名（每个年龄组140人以上）进行了调查。用低率单位回归法求出半数月经初潮年龄，再分别求95％的允许限和95％的可信限。调查结果表明?
The early period of menstruation is an important index reflecting women’s development and sexual maturity. To understand the situation of women’s early menstrual age in Northwest Yunnan, we used the current survey method to compare the number of Han women and girls in urban and rural areas aged 7 to 18 with 1628 (more than 140 in each age group). )We conducted a survey. Using the low-rate unit-regression method to find the menarche age of half of the menstrual period, we then calculated the allowable limit of 95% and the confidence limit of 95%. The survey results show?