将参照人群体格测量值按大小顺序排列，求出与某些百分位相对应的值。以P50为中位数，其余百分位数为离散距，以此来划分儿童体格生长的等级的方法是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25509' and id < 2147468 and id<>'2147468' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25509' and id > 2147468 and id<>'2147468' order by id asc limit 5