The prevalence of chronic conditions has risen to unprecedented levels over the past twenty years, with nearly 1-in-3 young people estimated to now be living with pediatric onset conditions that significantly affect their lives, new research suggests. This rise is largely driven by ADHD/ADD, autism, asthma, prediabetes and depression/anxiety, said Lauren Wisk, an assistant professor of medicine in the division of general internal medicine and health services research at the David Geffen School of Medicine at UCLA.