内蒙古8个群体女生月经初潮的月分布

作者调查了内蒙古自治区８个群体女学生月经初潮的月分布情况。调查结果显示８个群体初潮月分布曲线和呈双峰特征，一个峰位于冬季（１２－２月），一个峰位于夏季（６－８月）。作者认为双峰特征产生的原因与女生的精神因素、体脂、光照变化有关。初潮的季节分布受遗传因素的影响，同一民族内不同群体冬、夏季高峰的峰顶所在的月份之间的差异与生活的环境因素有一定关系。

MONTHLY DISTRIBUTION OF MENARCHE OF EIGHT GROUPS OF SCHOOLGIRLS IN INNER MONGOLIA

Monthly distribution of menarche of & groups of schoolgirls in Irmer Mongolia Autonomotis Region was investigated. Results shown are that all of the & groups give characters ofdouble peak in monthly distribution curve of menarche. One peak in winter(September-Feburary), another in summer (June-August). The appearance of the double peakcharacter, concerned spirit factors, body lipoid and variation of the sunshine. Season distribution of menarche is affected by hereditary factor. Dffeence between the months of differentgroups in which the peaks located is affected by environmental factor.