More U.S. children today are living with chronic health conditions. The rate of such conditions as obesity, asthma and behavior or learning problems increased from 12.8 percent in 1994 to 26.6 percent in 2006, according to a new study published in the Journal of the American Medical Association.

The new study was conducted by researchers from the MassGeneral Hospital for Children in Boston, who found that having a chronic condition was dynamic over time, meaning that some conditions went into remittance during the period studied.

The study’s goal was to help doctors design future health policies, make accurate clinical predictions and target interventions to prevent chronic conditions.