title: Response rate in the Study of Cardiovascular Risks in Adolescents - ERICA.
abstract: OBJECTIVE To describe the response rate and characteristics of people who either took part or not in from the Study of Cardiovascular Risks in Adolescents (ERICA) , according to information subsets. METHODS ERICA is a school-based, nation-wide investigation with a representative sample of 12 to 17-year-old adolescents attending public or private schools in municipalities with over 100,000 inhabitants in Brazil. Response rate of eligible subjects were calculated according to macro-regions, sex, age, and type of school (public or private). We also calculated the percentages of replacement schools in comparison with the ones originally selected as per the sample design, according to the types of schools in the macro-regions. The subjects and non-subjects were compared according to sex, age, and average body mass indices (kg/m2). RESULTS We had 102,327 eligible adolescents enrolled in the groups drawn. The highest percentage of complete information was obtained for the subset of the questionnaire (72.9%). Complete information regarding anthropometric measurements and the ones from the questionnaire were obtained for 72.0% of the adolescents, and the combination of these data with the 24-hour dietary recall were obtained for 70.3% of the adolescents. Complete information from the questionnaire plus biochemical blood evaluation data were obtained for 52.5% of the morning session adolescents (selected for blood tests). The response percentage in private schools was higher than the one in public schools for most of the combination of information. The ratio of older and male adolescents non-participants was higher than the ratio among participants. CONCLUSIONS The response rate for non-invasive procedures was high. The response rate for blood collection - an invasive procedure that requires a 12-hour fasting period and the informed consent form from legal guardians - was lower. The response rate observed in public schools was lower than in the private ones, and that may reflect lower school frequency of registered students.
authors.affiliation: Instituto de Estudos em Saúde Coletiva, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Thiago Luiz Nogueira
authors.initials: TL
authors.lastname: da Silva
authors.affiliation: Departamento de Epidemiologia, Escola Nacional de Saúde Pública Sérgio Arouca, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brasil.
authors.forename: Carlos Henrique
authors.initials: CH
authors.lastname: Klein
authors.affiliation: Instituto de Estudos em Saúde Coletiva, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Amanda de Moura
authors.initials: Ade M
authors.lastname: Souza
authors.affiliation: Departamento de Vigilância de Doenças e Agravos Não Transmissíveis e Promoção da Saúde, Secretaria de Vigilância em Saúde, Ministério da Saúde, Brasília, DF, Brasil.
authors.forename: Laura Augusta
authors.initials: LA
authors.lastname: Barufaldi
authors.affiliation: Instituto de Medicina Social, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Gabriela de Azevedo
authors.initials: Gde A
authors.lastname: Abreu
authors.affiliation: Núcleo de Estudos da Saúde do Adolescente, Faculdade de Ciência Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Maria Cristina Caetano
authors.initials: MC
authors.lastname: Kuschnir
authors.affiliation: Escola Nacional de Ciências Estatísticas, Fundação Instituto Brasileiro de Geografia e Estatística, Rio de Janeiro, RJ, Brasil.
authors.forename: Mauricio Teixeira Leite
authors.initials: MT
authors.lastname: de Vasconcellos
authors.affiliation: Instituto de Estudos em Saúde Coletiva, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Katia Vergetti
authors.initials: KV
authors.lastname: Bloch
mesh_terms: D000293:Adolescent; D000886:Anthropometry; D001938:Brazil / Q000453:epidemiology; D002318:Cardiovascular Diseases / Q000453:epidemiology*; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D012307:Risk Factors; D012574:Schools / Q000706:statistics & numerical data; D012959:Socioeconomic Factors; D013334:Students / Q000706:statistics & numerical data; D011795:Surveys and Questionnaires