Childhood Obesity in an Inner-City Primary Care Population: A Longitudinal Study

Background: Understanding the dynamics of obesity among children and adolescents in high-risk, low-income patient populations is critical to guide and evaluate appropriate clinical and public health interventions. Methods: We identified a cohort of 472 predominantly low-income, minority pediatric patients aged 3-18 years with baseline measurements in 2010 and analyzed follow-up data through September 2013. Weight status at baseline and end of follow-up were ascertained. Results: The prevalence of obesity was 25% (95% confidence interval [CI] 21%-29%) at baseline and 24% (95% CI 20%-28%) after an average of 2.3 years follow-up. Among the 353 subjects who were not obese at baseline, the cumulative incidence of obesity was 8% (95% CI 5%-11%). Those who were normal weight at baseline had an incidence of 3% (1%-6%); those who were overweight had an incidence of 22% (95% CI 14%-32%). Among the 119 subjects who were obese at baseline, 29% (95% CI 21%-38%) were not obese at the end of follow-up. Remission of obesity among those who were severely obese was only 12% (95% CI 4%-26%); among other obese patients remission was 38% (95% CI 28%-50%). Conclusion: The prevalence of obesity did not change substantially during follow-up. The cumulative incidence of obesity was 8%, and most of the incidence was among children who were overweight at baseline. Remission was common, especially among those who were not severely obese at baseline. Understanding and addressing determinants of obesity over the lifecourse is critical to the long-term health of children in the United States.