A Meta-Analysis of Single-Case Research on Applied Behavior Analytic Interventions for People With Down Syndrome.

Dargue et al. (2021) pooled 125 single-case ABA studies on people with Down syndrome. They kept only the 36 highest-quality papers. The team looked at how well ABA worked for talking skills and problem behavior.

ABA gave a medium-sized boost for both talking and behavior goals. The gains held up no matter how old the person was or where therapy happened.

Edgin et al. (2017) built a Down syndrome test battery that shows low practice effects. Nicole’s team could use these tools to track ABA progress without scores drifting upward just from repeated testing.

English et al. (1995) found that past schizophrenia did not hurt long-term adaptive skills in adults with Down syndrome. Nicole’s meta adds that ABA can still improve those same skills, even if psychiatric history is present.

Lowenthal et al. (2007) counted autism features in 1 out of 6 people with Down syndrome. Nicole’s review shows ABA works for the whole Down group, including those with extra autism traits.

You now have solid numbers to show funders and families: ABA gives reliable, medium-sized gains for talking and behavior in Down syndrome. Use brief single-case designs and graph the data; the literature says your charts will likely show the same upward trend. If a client also has autism traits or past mental-health issues, keep going—evidence says ABA still helps.