Researchers increasingly employ longitudinal trajectory methods to understand developmental pathways of people on the autism spectrum across the lifespan. By assessing developmental or health-related outcome domains at three or more timepoints, trajectory studies can characterize their shape and varying rates of change over time. The purpose of…

Longitudinal analyses have revealed informative patterns about health, mental health, adaptive skills, autism symptoms, and social skills during the transition to adulthood for autistic individuals. This study expands on these findings by investigating the trajectories of positive affect from age 15 to 30 years using a heterogeneous cohort (n =…