Follow-Up Study of Youth Who Received EIBI as Young Children.

Perry et al. (2019) tracked kids who got Early Intensive Behavioral Intervention as preschoolers. They wanted to know if the gains stuck around ten years later.

The team looked at IQ, daily-living skills, and autism severity. They used the same tests from childhood and teen years.

Most teens kept their boosts in thinking, self-care, and social skills. Scores stayed stable even though therapy had stopped years earlier.

Some kids slipped a little, but the group as a whole held its ground.

Ferguson et al. (2020) ran a near-copy study and saw the same steady gains after only three years. Together, the two papers show community EIBI works short- and long-term.

Eldevik et al. (2026) pooled data from 15 studies and found big IQ and adaptive jumps under EIBI. The 2019 follow-up proves those jumps can last a decade.

Giallo et al. (2014) showed the biggest payoffs happen when kids start before age two. Adrienne et al. now show those early starters still benefit ten years on.

You can tell families that full-dose EIBI in a community clinic can give lasting gains. Keep monitoring old clients; if scores slip, booster sessions may help.