title: Restandardization of DDST from six cities in north China. The Collaborative Study Group of Child Developmental Test.
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D002681:China; D005260:Female; D006801:Humans; D007223:Infant; D007361:Intelligence Tests / Q000592:standards*; D008297:Male; D008403:Mass Screening; D009048:Motor Skills