Phillips, Christine; Yates, Rachel; Glasgow, Nicholas; Ciszek, Karen; Attewell, Robyn
Objective: Supplementary questionnaires provide additional information from subgroups, but may have an attritional effect on response rates. We examined the effects of different instruction methods on response rates to a two-part questionnaire. Methods: The ACT Kindergarten Health Survey comprises a health questionnaire for all school-entry children. A supplementary questionnaire targets children with respiratory symptoms. We cluster-randomised 109 schools in the ACT (4,494 children) to two...[Show more]
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