Please cite this article in press as: Keating C, et al. Prevalence of class-I, class-II and class-III obesity in Australian adults between 1995 and 2011—12. Obes Res Clin Pract (2015), http://dx.doi.org/10.1016/j.orcp.2015.02.004 ARTICLE IN PRESS ORCP-421; No. of Pages 10 Obesity Research & Clinical Practice (2015) xxx, xxx—xxx ORIGINAL ARTICLE Prevalence of class-I, class-II and class-III obesity in Australian adults between 1995 and 2011—12 Catherine Keating a,b,* , Kathryn Backholer a , Emma Gearon a,c , Christopher Stevenson d , Boyd Swinburn e,f , Marj Moodie b , Rob Carter b , Anna Peeters a a Obesity and Population Health, Baker IDI Heart and Diabetes Institute, Melbourne, Australia b Deakin Health Economics, Deakin University, Melbourne, Australia c School of Public Health and Preventative Medicine, Monash University, Melbourne, Australia d School of Health and Social Development, Deakin University, Melbourne, Australia e World Health Organisation Collaborating Centre for Obesity Prevention, Deakin University, Melbourne, Australia f Population Nutrition and Global Health, University of Auckland, Auckland, New Zealand Received 12 September 2014 ; received in revised form 21 November 2014; accepted 8 February 2015 KEYWORDS Obesity; Prevalence; Trends; Australia; Socioeconomic Summary Objective: To compare the prevalence of class-I, II and III obesity in Australian adults between 1995, 2007—08 and 2011—12. Methods: Prevalence data for adults (aged 18+ years) were sourced from cus- tomised data from the nationally representative National Nutrition Survey (1995), the National Health Survey (2007—08), and the Australian Health Survey (2011—12) conducted by the Australian Bureau of Statistics. Obesity classifications were based on measured height and weight (class-I body mass index: 30.0—34.9 kg/m 2 , class-II: 35.0—39.9 kg/m 2 and class-III: ≥40.0 kg/m 2 ). Severe obesity was defined as class-II or class-III obesity. * Corresponding author at: Baker IDI Heart and Diabetes Institute, Level 4, 99 Commercial Road, Melbourne, VIC 3004, Australia. Tel.: +61 03 8532 1866; fax: +61 03 8532 1100. E-mail addresses: catherine.keating@bakeridi.edu.au, cathkeating@gmail.com (C. Keating). http://dx.doi.org/10.1016/j.orcp.2015.02.004 1871-403X/© 2015 Asian Oceanian Association for the Study of Obesity. Published by Elsevier Ltd. All rights reserved.