Abstract
The European Youth Heart Study (EYHS) addresses cardiovascular disease risk factors and their determinants in European children and adolescents. The Swedish part of the study began with cross-sectional data collection in 9- and 15-year-old schoolchildren in 1998–1999 (EYHS-I). Repeated observations of the key indicators were performed in 2004–2005 (EYHS-II). The purpose of this study was to assess potential dropout effects in EYHS-II. Participants in both EYHS-I and EYHS-II (n=459) were compared with dropouts who participated only in the EYHS-I (n=678) in relation to baseline physical activity, cardiorespiratory fitness and socioeconomic and anthropometric characteristics. Bivariate comparisons were performed using chi-square tests and gamma tests for nominal and ordinal data, respectively. Continuous data were compared by t tests and Mann−Whitney tests depending on the distribution. The Bonferroni correction was used to control for multiple hypothesis testing. Multiple logistic regression with backward elimination of variables was applied to study independent effects of variables on the probability of becoming a dropout. Analyses were performed separately for the younger and older age groups. The dropout proportion in EYHS-II was 60%. Subjects from the older age group were less likely to participate in the follow-up study (32% vs. 50%, p<0.001). In bivariate analyses, only maternal education was associated with dropout rates in the younger age group after Bonferroni correction. Males were more likely to drop out in both younger [odds ratio (OR)=1.72; 95% confidence interval (CI): 1.10, 2.96] and older (OR=1.96; 95% CI: 1.09, 3.54) age groups while basic maternal education was associated with outcome only in the younger group (OR=4.31; 95% CI: 1.78, 2.95) in regression analysis. The Swedish EYHS-II had high dropout rate after EYHS-I, but the dropouts did not differ from the participants in relation to physical activity, physical fitness, and anthropometric indices. Males were more likely to drop out than were females in both age groups. Differential dropout in relation to maternal education was observed in the younger age group.
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References
Barker DJ (2003) Coronary heart disease: a disorder of growth. Horm Res 59 Suppl 1:35–41
Berg C, Jonsson I, Conner MT, Lissner L (1998) Sources of bias in a dietary survey of children. Eur J Clin Nutr 52:663–667
Deshmukh-Taskar P, Nicklas TA, Morales M, Yang SJ, Zakeri I, Berenson GS (2006) Tracking of overweight status from childhood to young adulthood: the Bogalusa Heart Study. Eur J Clin Nutr 60:48–57
Gnavi R, Spagnoli TD, Galotto C, Pugliese E, Carta A, Cesari L (2000) Socioeconomic status, overweight and obesity in prepuberal children: a study in an area of Northern Italy. Eur J Epidemiol 16:797–803
Hansen, HS, K Froberg, JR Nielsen, N Hyldebrandt (1989) A new approach to assessing maximal aerobic power in children: the Odense School Child Study. Eur J Appl Physiol Occup Physiol 58:618–624
Hurtig-Wennlöf A, Yngve A, Sjöström M (2003) Sampling procedure, participation rates and representativeness in the Swedish part of the European Youth Heart Study (EYHS). Public Health Nutr 6:291–299
Irala-Estevez JD, Groth M, Johansson L, Oltersdorf U, Prattala R, Martinez-Gonzalez MA (2000) A systematic review of socio-economic differences in food habits in Europe: consumption of fruit and vegetables. Eur J Clin Nutr 54:706–714
Janssen I, Boyce WF, Simpson K, Pickett W (2006) Influence of individual- and area-level measures of socioeconomic status on obesity, unhealthy eating, and physical inactivity in Canadian adolescents. Am J Clin Nutr 83:139–145
Kivimaki M, Lawlor DA, Smith GD, Keltikangas-Jarvinen L, Elovainio M, Vahtera J, Pulkki-Raback L, Taittonen L, Viikari JS, Raitakari OT (2006). Early socioeconomic position and blood pressure in childhood and adulthood: the Cardiovascular Risk in Young Finns Study. Hypertension 47:39–44
Klein-Platat C, Wagner A, Haan MC, Arveiler D, Schlienger JL, Simon C (2003) Prevalence and sociodemographic determinants of overweight in young French adolescents. Diabetes Metab Res Rev 19:153–158
Kristensen PL, Wedderkopp N, Moller NC, Andersen LB, Bai CN, Froberg K (2006) Tracking and prevalence of cardiovascular disease risk factors across socio-economic classes: a longitudinal substudy of the European Youth Heart Study. BMC Public Health 6:20
Langnase K, Mast M, Muller MJ (2002) Social class differences in overweight of prepubertal children in northwest Germany. Int J Obes Relat Metab Disord 26:566–572
Last JM (2001) A Dictionary of Epidemiology (4th Edition). Oxford University Press, New York
Lawlor DA, Harro M, Wedderkopp N, Andersen LB, Sardinha LB, Riddoch CJ, Page AS, Anderssen SA, Froberg K, Stansbie D, Davey Smith G (2005) Association of socioeconomic position with insulin resistance among children from Denmark, Estonia, and Portugal: cross sectional study. BMJ 331:183–188
Lohman TG, Roche AF, Martorell R, eds. (1988) Anthropometric standardization reference manual. Abridged edition. Human Kinetics Books, Champaign, IL
Metcalf BS, Curnow JS, Evans C, Voss LD, Wilkin TJ (2002) Technical reliability of the CSA activity monitor: The Early Bird Study. Med Sci Sports Exerc 34:1533–1537
Moreno LA, Tomas C, Gonzalez-Gross M, Bueno G, Perez-Gonzalez JM, Bueno M (2004) Micro-environmental and socio-demographic determinants of childhood obesity. Int J Obes Relat Metab Disord 3(Suppl 28):S16–S20
Nicklas TA, von Duvillard SP, Berenson GS (2002) Tracking of serum lipids and lipoproteins from childhood to dyslipidemia in adults: the Bogalusa Heart Study. Int J Sports Med 23(Suppl 1):S39–S43
Poortvliet E, Yngve A, Ekelund U, Hurtig-Wennlöf A, Nilsson A, Hagstromer M, Sjöström M (2003) The European Youth Heart Survey (EYHS): an international study that addresses the multi-dimensional issues of CVD risk factors. Forum Nutr 56:254–256
Riddoch, C, Edwards D, Page A, Froberg, K, Anderssen SA, Weddekopp N, Brage S, Cooper AR, Sardinha, L, Harro M, Klasson-Heggebø, Mechelen W, Boreham C, Ekelund U, Andersen L, the EYHS team (2005) The European Youth Heart Study - Cardiovascular disease risk factors in children: rationale, aims, study design, and validation of methods. JPAH 2:115–129
Tanner J (1962) Growth at adolescence. Blackwell, Oxford
Twisk JWR, Kemper HCG, Mechelen W van, Post GB (1997) Tracking of risk factors for coronary heart disease over a 14 year period: A comparison between lifestyle and biological risk factors with data from the Amsterdam Growth and Health Study. Am J Epidemiol 145:888–898
Yang X, Telama R, Viikari J, Raitakari OT (2006) Risk of obesity in relation to physical activity tracking from youth to adulthood. Med Sci Sports Exerc 38:919–925
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Grjibovski, A.M., Bergman, P., Hagströmer, M. et al. A dropout analysis of the second phase of the Swedish part of the European Youth Heart Study. J Public Health 14, 261–268 (2006). https://doi.org/10.1007/s10389-006-0057-1
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DOI: https://doi.org/10.1007/s10389-006-0057-1