title: Body mass index and smoking: cross-sectional study of a representative sample of adolescents in Denmark.
abstract: OBJECTIVE
  To quantify the association between body mass index (BMI) and smoking (at all and daily smoking) stratified by gender, family social class, and ethnicity among adolescents aged between 13 and 15.
  
  
  METHODS
  The analyses were based on the Danish contribution to the international Health Behaviour in School-aged Children survey in 2002 with self-reported data on height, weight, and smoking behaviour. The study population comprised 3,072 students aged between 13 and 15 (1,512 boys and 1,560 girls). Logistic regression analysis was used to quantify the association.
  
  
  RESULTS
  Odds of at all smoking by BMI (per step) was 1.10 (95% CI 1.03-1.17) among boys but there was no association among girls (OR 0.98, 95% CI 0.93-1.04). No significant association was found for daily smoking and BMI. The association between at all smoking and BMI (per step) was significant among boys of middle social class (OR 1.13, 95% CI 1.03-1.24) and Danish ethnicity (OR 1.10, 95% CI 1.02-1.19).
  
  
  CONCLUSIONS
  Significant association exists between smoking and BMI among boys of Danish ethnicity and middle family social class only.
authors.affiliation: Department of Public Health, NHS Fife Windygages, Fife, UK. mukesh.dhariwal@nhs.net
authors.forename: Mukesh
authors.initials: M
authors.lastname: Dhariwal
authors.forename: Mette
authors.initials: M
authors.lastname: Rasmussen
authors.forename: Bjørn E
authors.initials: BE
authors.lastname: Holstein
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D000428:Alcohol Drinking / Q000453:epidemiology; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D003718:Denmark / Q000453:epidemiology; D005006:Ethnicity / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D017678:Sex Distribution; D012907:Smoking / Q000453:epidemiology* / Q000208:ethnology; D012923:Social Class