Prevalence and trends in overweight and obesity among Mississippi public school students, 2005-2011.

This study estimated the prevalence of overweight and obesity in Mississippi public school students in grades K - 12 and assessed changes in the prevalence between 2005 and 2011. In 2011, Body Mass Index was calculated using measured height and weight data for a weighted representative sample of 4,235 public school students. Additional analyses compared 2011 prevalence estimates by gender, race, and grade levels and for changes between 2005 and 2011. The prevalence of overweight and obesity among public school students no longer appears to be increasing although a significant downward trend was not observed (p = 0.0845), and rates remain higher than national averages. In 2011, the combined prevalence of overweight and obesity for all students in grades K - 12 was 40.9% as compared to 42.4% in 2009, 42.1% in 2007 and 43.9% in 2005. Significant decreases in overweight and obesity were found among white students and elementary school student groups from 2005 to 2011. White students' combined rates fell from 40.6% in 2005 to 34.8% in 2011 (p = 0.0006). Similarly, combined rates in elementary school students dropped from 43.0% in 2005 to 37.3% in 2011 (p = 0.0045). In 2011, the prevalence of overweight and obesity was significantly lower among white students than black students (p < 0.001) and significantly lower among white female students than black female students at all three grade levels. These findings are discussed in light of recent statewide educational initiatives and health disparities. Implications for future practice, policy, and research are presented.