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The impact of the method of consent on response rates in the ISAAC time trends study.

BACKGROUND: Centres in Phases I and III of the International Study of Asthma and Allergies in Childhood (ISAAC) programme used the method of consent (passive or active) required by local ethics committees. METHODS: Retrospectively, relationships between achieved response rates and method of consent for 13-14 and 6-7-year-olds (adolescents and children, respectively), were examined between phases and between English and non-English language centres. RESULTS: Information was obtained for 113 of 115 centres for adolescents and 72/72 centres for children. Both age groups: most centres using passive consent achieved high response rates (>80% adolescents and >70% children). English language centres using active consent showed a larger decrease in response rate. Adolescents: seven centres changed from passive consent in Phase I to active consent in Phase III (median decrease of 13%), with five centres showing lower response rates (as low as 34%). Children: no centre changed consent method between phases. Centres using active consent had lower median response rates (lowest response rate 45%). CONCLUSION: The requirement for active consent for population school-based questionnaire studies can impact negatively on response rates, particularly English language centres, thus adversely affecting the validity of the data. Ethics committees need to consider this issue carefully. / RevisiĆ³n por pares

Identiferoai:union.ndltd.org:PERUUPC/oai:repositorioacademico.upc.edu.pe:10757/625750
Date01 August 2010
CreatorsEllwood, P, Asher, M I, Stewart, A W, Chiarella, Pacual, ISAAC Phase III Study Group
Contributorsp.ellwood@auckland.ac.nz
Publishernternational Union against Tubercul. and Lung Dis.
Source SetsUniversidad Peruana de Ciencias Aplicadas (UPC)
LanguageEnglish
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/article
Formatapplication/pdf
SourceUniversidad Peruana de Ciencias Aplicadas (UPC), Repositorio Academico - UPC, The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease, 14, 1060-1065
Rightsinfo:eu-repo/semantics/openAccess, Attribution-NonCommercial-ShareAlike 3.0 United States, http://creativecommons.org/licenses/by-nc-sa/3.0/us/

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