A Longitudinal Study of Children Diagnosed with Autism Spectrum Disorder Before Age Three: School Services at Three Points Time for Three Levels of Outcome Disability.

Towle et al. (2018) followed 100 Minnesota children who got an autism diagnosis before age 3. They checked school records three times: at preschool, kindergarten, and second grade. They grouped kids by outcome: still ASD, new ASD label, or no longer ASD. Then they counted special-ed minutes, related services, and placement type for each group.

Kids who kept the ASD label kept the heaviest load. They averaged 29 hours of special-ed per week in second grade. Children who lost the label dropped to 7 hours. Speech, OT, and paraprofessional hours fell the same way. Placement shifted too: a large share of the retained-ASD group spent most of the day in self-contained rooms; only a large share of the no-label group did.

Giserman-Kiss et al. (2020) extends these numbers. That team found a large share of very early diagnoses stick, matching the kids who kept services here. Their data show the same kids also made big cognitive gains, so heavy service levels may pay off.

Jónsdóttir et al. (2007) looked at symptom change, not services. They saw stable IQ and falling autism scores across the preschool years. O’s paper adds the school-system view: even when symptoms ease, service intensity stays high if the ASD label remains.

Ahlborn et al. (2008) tracked inclusion for kids with mild delays. Inclusion rates fell from preschool to second grade, just like O found for the ASD group. The pattern looks similar across diagnoses: more pull-outs as academic demands rise.

Check your caseload for second-graders still carrying the early ASD label. Expect them to need the full package: self-contained room, full-time aide, and multiple therapies. If a child no longer meets criteria, use O’s numbers to justify a lighter plan and more gen-ed time. Share the data with parents and IEP teams to keep services matched to current function, not old paperwork.