Prevalence of transition planning among children with special healthcare needs (CSCHN), ages 12–17 years, with heart problems compared to those without heart problems, National Survey for Children with Special Health Care Needs, United States, 2009–2010. The prevalence of four transition-planning components among CSCHN ages 12–17 years stratified by presence of a heart problem and the respective adjusted prevalence ratios comparing children with special healthcare needs with heart problems to those without heart problems