When using the WFH or WFL method in a surveillance program, a random sample of children from 6 to 59 months of age (under 5 years of age) or less than 110 cm tall are weighed and measured regularly.

• 在监控过程中使用体重身高比或体重长度比测量方法时，以随机抽样方式选出年龄从6至59个月（5周岁以下）或身高110厘米以下的儿童，对他们的体重和身高进行定期测量。