title: Long-term trends in obesity among Austrian adults and its relation with the social gradient: 1973-2007.
abstract: BACKGROUND
  The prevalence of obesity is steadily increasing. There is little empirical evidence for the development of obesity in Austria. Therefore, the present study investigated long-term trends in the prevalence of obesity across different age and educational groups in Austrian adults.
  
  
  METHODS
  Self-reported data were derived from five nationally representative cross-sectional interview surveys (n = 178,818) in the years 1973, 1983, 1991, 1999 and 2006-07 in private homes and long-term care facilities for Austrian adults aged 20-99 years. An adjustment of the self-reported BMI was performed. Obesity was defined as BMI ≥ 30 kg m(-2).
  
  
  RESULTS
  The age-adjusted prevalence of obesity was 11% during the study period (women: 11.3%, 95% CI 11.2-11.6; men: 9.9%, 95% CI 9.7-10.2). Obesity and a high mean BMI were most prevalent among subjects aged 55-74 years and among those with low educational status. The absolute change in obesity prevalence during the study period was significantly highest (P < 0.001) among women aged ≥ 75 years (3.0%), and among men aged 55-75 years (3.6%). Concerning educational level, the largest increase in obesity was seen in those with a low educational level (women: 4.1%, men: 2.6%; P < 0.001), whereas the aetiologic fraction was highest in middle-educated men. Relative inequalities for obesity showed a tendency to increase during the study period.
  
  
  CONCLUSIONS
  Examining trends in subpopulations is important when planning accurate target group-specific prevention strategies. Therefore, in Austria targeted preventive measures should be designed according to age and educational level.
authors.affiliation: Institute of Social Medicine and Epidemiology, Universitätsstraße 6/I, 8010 Graz, Austria.
authors.forename: Franziska
authors.initials: F
authors.lastname: Großschädl
authors.forename: Willibald J
authors.initials: WJ
authors.lastname: Stronegger
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001317:Austria / Q000453:epidemiology; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D004522:Educational Status; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology*; D011159:Population Surveillance; D015995:Prevalence; D012044:Regression Analysis; D017678:Sex Distribution; D012737:Sex Factors; D012923:Social Class; D013997:Time Factors