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为了解我区中小学生扁平足的发生情况及其影响因素,于1986年9月～10月,对临洮、定西两县采取分层抽样,抽得21所中小学(县城4所,川区5所,丘陵5所,山区7所)学生11888名(男7318名,女4570名),用足印法判断、分级。结果分析如下:
In order to understand the occurrence of flatfoot in primary and secondary school students in our district and its influential factors, from September to October 1986, stratified sampling was carried out in Linqu and Dingxi counties to draw 21 primary and secondary schools (4 in the county, 5 in Sichuan , Hill 5, mountain 7) 11888 students (male 7318, female 4570), with footprints method to judge, grading. The results are as follows: