title: Blood pressure tracking in Korean schoolchildren.
abstract: BACKGROUND
  Many studies have examined the blood pressure tracking among children and adolescents, but the results have been mixed. This study examined blood pressure tracking in 304 Korean school children following them for 5 years from age 6 to 11.
  
  
  METHODS
  In addition to the examination of relative ranking, in percentile groups, of blood pressure and time-lag correlation analysis, we used the McMahan's tracking index, tau (tau), which indicates the proportion of variation attributable to tracking apart from the natural growth (increase) component.
  
  
  RESULTS
  There was strong evidence for tracking during the pre-teen years, particularly when it was analysed using McMahan's tracking index. Tau for systolic blood pressure was 0.877 (+/- 0.028) in males and 0.792 (+/- 0.044) in females. For diastolic blood pressure tau was found to be 0.924 (+/- 0.070) in males and 0.762 (+/- 0.075) in females.
  
  
  CONCLUSIONS
  This study supported the existence of blood pressure tracking in children, but data were insufficient to examine the effect of puberty on tracking. The need for further research is emphasized with the aim of incorporating biological and behavioural factors and targeting preventive intervention.
authors.affiliation: Department of Preventive Medicine and Public Health, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: I
authors.initials: I
authors.lastname: Suh
authors.forename: C M
authors.initials: CM
authors.lastname: Nam
authors.forename: E S
authors.initials: ES
authors.lastname: Lee
authors.forename: I S
authors.initials: IS
authors.lastname: Kim
authors.forename: S Y
authors.initials: SY
authors.lastname: Lee
mesh_terms: D000367:Age Factors; D015982:Bias; D001794:Blood Pressure; D002648:Child; D005260:Female; D006128:Growth; D006801:Humans; D006973:Hypertension / Q000175:diagnosis / Q000453:epidemiology*; D007723:Korea / Q000453:epidemiology; D008137:Longitudinal Studies; D008297:Male; D009200:Myocardial Contraction; D011159:Population Surveillance / Q000379:methods*; D011627:Puberty; D012737:Sex Factors; D013997:Time Factors