When data were examined from the eight years included in our analyses, the cumulative prevalence differed significantly between 2004 and 2011 for all U.S. children, but even in the year with the lowest prevalence, it was high. The cumulative prevalence fluctuated from 12.0% [95% CI: 12.0%, 12.0%] in 2009 to 15.1% [95% CI: 15.1%, 15.1%] in 2005 (Figure 3).
