Objective to know the state of pre menstrual preparation of Han and Mongolia secondary and primary school girls and to provide basis for puberty school health education.
目的了解城乡蒙汉族中小学女生的经前准备情况，为开展青春期健康教育提供科学依据。
Objective to know the state of pre menstrual preparation of Han and Mongolia secondary and primary school girls and to provide basis for puberty school health education.
目的了解城乡蒙汉族中小学女生的经前准备情况，为开展青春期健康教育提供科学依据。
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