Adult care engagement and care abandonment. Since program implementation in 2007, there has been a decrease in the number of patients who have abandoned pediatric care (β = −2.91; P = .002) (blue line), an increase in completion of transition (green line), and an increase in completion of the first visit with the adult provider after leaving pediatric care (β = 4.82; P ≤ .001). A gradual decline in care abandonment (red line) after transfer to adult care is shown from 2003 to 2017 (β = −1.91; P = .004).