The effect of stereotypies on adaptive skills as assessed with the DASH-II and Vineland Adaptive Behavior Scales.

The team gave the adults with intellectual disability two tests. One was the DASH-II, a checklist for problem behaviors. The other was the Vineland Adaptive Behavior Scales, a survey that asks how well the person cooks, talks, and gets dressed.

They split the group by DASH-II stereotypy scores. Anyone above the cut-off went in the “high-stereotypy” pile. Then they compared Vineland scores between the two piles.

The high-stereotypy group scored much lower on every Vineland area. Daily living, communication, and social skills all dropped. The gap was large enough to matter in real life—think “needs help with zippers” versus “zips alone.”

Stereotypy alone predicted lower adaptive skills even after age and IQ were held still.

de Bildt et al. (2005) showed the Vineland is reliable in ID samples, so we can trust the low scores here are real, not measurement noise.

Green et al. (2020) warn that newer Vineland-3 editions give lower numbers than older ones. If you re-test today, expect scores to look even worse—plan your goals accordingly.

Dudley et al. (2019) found IQ and Vineland barely correlate in adults with ID. L et al. echo that: stereotypy, not IQ, was the big predictor this time. Together the papers tell us to watch behavior, not just intelligence tests.

When the DASH-II stereotypy section is high, start teaching adaptive skills right away. Don’t wait for IQ testing or problem behavior plans to finish. Pair the two tools at intake: DASH-II flags risk, Vineland shows which life skills need immediate goals. You can write one short objective—say, “Learner will put on coat within 30 s across five trials”—and track it while you reduce stereotypy later.