title: Physical activity, Body Mass Index and health care costs in mid-age Australian women.
abstract: OBJECTIVE
  This study examined the relationships between combined categories of physical activity (PA) and Body Mass Index (BMI) with health care costs in women and assessed the potential cost savings of improving PA and BMI in sedentary mid-age women.
  
  
  METHODS
  Cross-sectional analysis of 2001 survey data linked to health service use data for the same year from 7,004 mid-age women (50-55 years) participating in the Australian Longitudinal Study on Women's Health.
  
  
  RESULTS
  The mean (median; interquartile range) annual cost of Medicare-subsidised services was $542 (355; 156-693) per woman. Costs were 17% higher in obese than in healthy-weight women and 26% higher in sedentary than in moderately active women. For sedentary obese women, mean costs were 43% higher than in healthy weight, moderately active women. After adjustment for potential confounders, the relative risk of 'high' claims (>or=15 claims per year) for overweight women who reported 'moderate' or 'high' PA were lower than for women with healthy BMI who reported no PA.
  
  
  CONCLUSIONS
  Lower PA and higher BMI are both associated with higher health care costs, but costs are lower for overweight active women than for healthy-weight sedentary women. At the population level these data suggest that there would be significant cost savings if all sedentary mid-age women could achieve at least 'low' levels of PA (60-150 minutes a week).
authors.affiliation: School of Human Movement Studies, University of Queensland, St Lucia, Queensland, Australia. wbrown@hms.uq.edu.au
authors.forename: Wendy J
authors.initials: WJ
authors.lastname: Brown
authors.forename: Richard
authors.initials: R
authors.lastname: Hockey
authors.forename: Annette J
authors.initials: AJ
authors.lastname: Dobson
mesh_terms: D001315:Australia; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005260:Female; D017048:Health Care Costs; D006304:Health Status; D006306:Health Surveys; D006801:Humans; D008019:Life Style; D008875:Middle Aged; D009043:Motor Activity; D009765:Obesity / Q000191:economics / Q000517:prevention & control*; D050177:Overweight; D012306:Risk; D012307:Risk Factors; D012907:Smoking; D016387:Women's Health