About the Tool
This interactive data visualization tool shows estimated trends in obesity and overweight prevalence worldwide and by country for the years 1980 to 2013. Data were derived from surveys, reports, and published studies that included data for height and weight, both through physical measurements and self-reports. We used mixed effects linear regression to correct for bias in self-reports. Data were obtained for prevalence of obesity and overweight by age, sex, country, and year with a spatiotemporal Gaussian process regression model to estimate prevalence with 95% uncertainty intervals.
- Body mass index (BMI) is a weight-to-height ratio. The formula for determining BMI is weight (kg) / [height (m)]2. Quickly calculate your own BMI by visiting: http://www.nhlbi.nih.gov/guidelines/obesity/BMI/bmicalc.htm
- Overweight persons have a BMI greater than or equal to 25 and less than 30.
- Obese persons have a BMI greater than or equal to 30.
How to Explore
- Expand any chart by using the small arrow button in the upper left corner.
- Navigate among the Worldwide, Country, and Data tabs to drill into increasing levels of detail.
- From the Worldwide view, click a country on the map or select it from the locations list to view a time trend in the line chart, or the number of obese or overweight people in the sunburst diagram. Zoom into the sunburst by clicking any of the ring segments. Use the green sliders on the line chart to select countries and narrow your focus.
- The Country view shows overweight and obesity trends at different ages, a chart of trends over time, and a population pyramid. Enable viewing uncertainty intervals or shifting the scales to show zero by checking or unchecking the associated checkboxes. Switch countries or country groups by using the location drop-down at the bottom of the page.
- The Data view provides a breakdown of source data by age group. Hover over a data point to view source information, or click the point to highlight other data points from the same source. Enable viewing uncertainty, locking/unlocking scales, and shifting the scales to show zero by checking or unchecking the associated checkboxes. Switch countries or country groups by using the location drop-down at the bottom of the page.
- Use the latest version of Internet Explorer (currently IE10), Chrome, or Firefox.
- Make sure to disable compatibility mode in Internet Explorer. In some cases, it renders a site unusable.
- Use Ctrl+0 to reset the browser zoom. Sometimes having the browser zoomed in or out interferes with the layout or a few mouse-dependent properties.
- If the visualization isn't loading or looks distorted, try clearing your cache. See http://www.wikihow.com/Clear-Your-Browser's-Cache for pointers.
Institute for Health Metrics and Evaluation (IHME). Overweight and Obesity Viz. Seattle, WA: IHME, University of Washington, 2014. Available from http://vizhub.healthdata.org/obesity. (Accessed [INSERT DATE])