title: Morbid obesity in women on the rise: an observational, population-based study.
abstract: BACKGROUND
  The obesity epidemic is generally monitored by the proportion of the population whose body mass index (BMI) exceeds 30 kg/m2 but this masks the growing proportion of those who are morbidly obese. This issue is important as the adverse health risks amplify as the level of obesity increases. The aim of this study was to determine how the prevalence of morbid obesity (BMI  ≥  40.0 kg/m2) has changed over a decade among women living in south-eastern Australia.
  
  
  METHODS
  BMI was determined for women in the Geelong Osteoporosis study (GOS) during two time periods, a decade apart. Height and weight were measured for 1,494 women (aged 20-94 years) during 1993-7 and for 1,076 women (aged 20-93 years), 2004-8, and the BMI calculated as weight in kilograms divided by the square of the height in metres (kg/m2). Prevalence estimates were age-standardised to enable direct comparisons.
  
  
  RESULTS
  Mean BMI increased from 26.0 kg/m2 (95%CI 25.7-26.3) in 1993-7, to 27.1 kg/m2 (95%CI 26.8-27.4) in 2004-8. During this period, the prevalence of morbid obesity increased from 2.5% to 4.2% and the standardised morbidity ratio for morbid obesity was 1.69 (95%CI 1.26-2.27). Increases in mean BMI and prevalence of morbid obesity were observed for all ages and across the socioeconomic spectrum.
  
  
  CONCLUSIONS
  These findings reveal that over a decade, there has been an increase in mean BMI among women residing in south-eastern Australia, resulting in a measurable increase in the prevalence of morbid obesity.
authors.affiliation: Epidemiology Unit for Musculoskeletal and Metabolic Disorders, School of Medicine, Deakin University, PO Box 281, Geelong, Victoria, 3220, Australia. juliep@barwonhealth.org.au.
authors.forename: Julie A
authors.initials: JA
authors.lastname: Pasco
authors.forename: Sharon L
authors.initials: SL
authors.lastname: Brennan
authors.forename: Mark A
authors.initials: MA
authors.lastname: Kotowicz
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001315:Australia / Q000453:epidemiology; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008875:Middle Aged; D009767:Obesity, Morbid / Q000453:epidemiology*; D015995:Prevalence; D012306:Risk; D013997:Time Factors; D055815:Young Adult
references.citation: Obesity (Silver Spring). 2007 Jan;15(1):197-208
references.pmid: 17228048
references.citation: Prev Med. 2009 Aug-Sep;49(2-3):165-71
references.pmid: 19576925
references.citation: Diabet Med. 2011 Jun;28(6):628-42
references.pmid: 21480973
references.citation: Obesity (Silver Spring). 2012 Dec;20(12):2367-76
references.pmid: 22673191
references.citation: World Health Organ Tech Rep Ser. 2000;894:i-xii, 1-253
references.pmid: 11234459
references.citation: Obes Res. 2004 Dec;12(12):1936-43
references.pmid: 15687394
references.citation: Med J Aust. 2005 Apr 4;182(7):344-7
references.pmid: 15804226
references.citation: PLoS One. 2012;7(1):e29580
references.pmid: 22253741
references.citation: Public Health. 2007 Jul;121(7):492-6
references.pmid: 17399752
references.citation: Int J Epidemiol. 2012 Dec;41(6):1565-75
references.pmid: 23283714
references.citation: Med J Aust. 2012 Aug 6;197(3):147
references.pmid: 22860786
references.citation: Swiss Med Wkly. 2008 Apr 5;138(13-14):204-10
references.pmid: 18389393