An explanatory test of a method of studying illness among preschool children.
D000367:Age Factors; D001955:British Columbia; D002675:Child, Preschool; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008297:Male; D009017:Morbidity; D010865:Pilot Projects; D012494:Sampling Studies; D012621:Seasons; D012737:Sex Factors; D011795:Surveys and Questionnaires