Validation of the Brazil SimSmoke: predictions versus survey estimates, 1989–2008.

The prevalence estimates are expressed as rates of current smokers per population, and percentage change values are over time relative to initial values, e.g., “percentage change 1989–2008” represents the difference in prevalence between 2008 and 1989 divided by the 1989 prevalence.aSurvey data are from the 1989 National Survey of Health and Nutrition, the 2003 World Health Survey, and the 2008 GATS.bPredictions are from the Brazil SimSmoke model as described in the text.