title: Impact of lifestyle factors on trends in lipid profiles among Korean adolescents: the Korea National Health and Nutrition Examination Surveys study, 1998 and 2010.
abstract: OBJECTIVE
  Only a few studies have explored nationwide trends in lipid profiles among Asian adolescents. We aimed to assess trends in lipid profiles and the associated lifestyle factors among Korean children.
  
  
  METHODS
  We analyzed data for 2,094 adolescents who were aged 10-18 years and had participated in the Korea National Health and Nutrition Examination Surveys in 1998 and 2010.
  
  
  RESULTS
  During 1998-2010, the prevalence of obesity significantly increased in boys, but no changes were observed in girls. Over this period, there was a small but significant decrease in the mean low-density lipoprotein (LDL)-cholesterol level in boys (1998, 87.5 mg/dL; 2010, 83.6 mg/dL; P=0.019) and mean triglyceride levels in girls (1998, 90.8 mg/dL; 2010, 85.8 mg/dL; P=0.020). There were no significant changes in the prevalence of dyslipidemia in boys, but a modest decrease was noted in girls (1998, 25.1%; 2010, 18.3%; P=0.052). During the study period, the prevalence of breakfast skipping decreased, whereas that of regular exercise increased in both groups. Daily total energy intake did not change between these years. In multivariable logistic regression analyses, breakfast skipping was associated with increased risk of hyper-LDL-cholesterolemia in boys (odds ratio [OR], 5.77) and hypertriglyceridemia (OR, 2.27) in girls. Regular exercise was associated with decreased risk of hypo-HDL-cholesterolemia (OR, 0.40) in boys.
  
  
  CONCLUSIONS
  Although the prevalence of obesity in boys increased, favorable or constant trends in lipid profiles were observed among Korean adolescents during 1998-2010. Decrease in breakfast skipping and increase in regular exercise may have contributed to these trends.
authors.affiliation: Department of Pediatrics, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
authors.forename: Shin-Hye
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Division of Cardiology, Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Young-Hwan
authors.initials: YH
authors.lastname: Song
authors.affiliation: Center for International Health Research, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, RI, USA.; Department of Pediatrics, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, RI, USA.
authors.forename: Sangshin
authors.initials: S
authors.lastname: Park
authors.affiliation: Department of Pediatrics, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
authors.forename: Mi-Jung
authors.initials: MJ
authors.lastname: Park
keywords: Adolescent; Dyslipidemias; Life style; Obesity; Trends