title: The Québec Child and Adolescent Health and Social Survey: design and methods of a cardiovascular risk factor survey for youth.
abstract: BACKGROUND
  Although atherosclerosis begins in childhood, there are no recent Canadian data on cardiovascular risk factors in provincially or nationally representative samples of youth.
  
  
  OBJECTIVE
  To describe the design and methods of the 1999 Québec Child and Adolescent Health and Social Survey, which assessed the prevalence and distribution of risk factors in a representative sample of Québec youth.
  
  
  METHODS
  School-based, multistage, cluster sampling survey of youth aged nine, 13 and 16 years. Measures included height, weight, subscapular and tricipital skinfolds, blood pressure (measured with the Dinamap), a fasting blood draw for assessment of lipoproteins and glucose, an age-adapted youth questionnaire on lifestyles and a parent questionnaire.
  
  
  RESULTS
  One thousand two hundred sixty-seven, 1186 and 1160 subjects aged nine, 13 and 16 years, respectively, responded to the questionnaire and had height, weight, skinfold thickness and blood pressure measured (response proportions of 83%, 79% and 78% respectively); 783, 818 and 874 subjects of the same age agreed to the blood draw (response proportions of 52%, 55% and 59%, respectively). Comparisons of characteristics of participants and nonparticipants in the blood draw showed few differences. The mean relative difference between lipoprotein and glucose values obtained at the study laboratory and a reference method varied from -0.3% to 6.1%. Design effects for means and proportions varied from 1.0 to 1.8.
  
  
  CONCLUSIONS
  Despite its complexity, this survey was able to achieve a high level of precision for multiple measures. It will provide the most complete data on cardiovascular risk factors ever collected among children and adolescents in Canada.
authors.affiliation: Direction de la santé publique de Montréal-Centre, Division of Preventive Medicine, McGill University Health Centre and Department of Epidemiology and Biostatistics, McGill University, Montréal, Québec. gilles.paradis@mcgill.ca
authors.forename: Gilles
authors.initials: G
authors.lastname: Paradis
authors.forename: Marie
authors.initials: M
authors.lastname: Lambert
authors.forename: Jennifer
authors.initials: J
authors.lastname: O'Loughlin
authors.forename: Claudette
authors.initials: C
authors.lastname: Lavallée
authors.forename: Jacinthe
authors.initials: J
authors.lastname: Aubin
authors.forename: Paul
authors.initials: P
authors.lastname: Berthiaume
authors.forename: Marielle
authors.initials: M
authors.lastname: Ledoux
authors.forename: Edgard E
authors.initials: EE
authors.lastname: Delvin
authors.forename: Emile
authors.initials: E
authors.lastname: Lévy
authors.forename: James A
authors.initials: JA
authors.lastname: Hanley
mesh_terms: D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D001786:Blood Glucose; D001794:Blood Pressure; D001827:Body Height; D001835:Body Weight; D002648:Child; D003324:Coronary Artery Disease / Q000453:epidemiology* / Q000209:etiology / Q000517:prevention & control*; D005260:Female; D006306:Health Surveys; D006801:Humans; D008019:Life Style; D008055:Lipids / Q000097:blood; D008297:Male; D015995:Prevalence; D011785:Quality Assurance, Health Care; D011792:Quebec / Q000453:epidemiology; D012307:Risk Factors; D012885:Skinfold Thickness; D011795:Surveys and Questionnaires
chemical_list: D001786:Blood Glucose; D008055:Lipids