Predicting adaptive behaviour of severely and profoundly mentally retarded children with early cognitive measures.

Kahn (1992) tracked kids with severe or profound intellectual disability.

They looked at early scores on language and daily-living tests.

Four years later they tested the same skills again to see what held true.

The first test scores were the best crystal ball.

Kids who started high stayed high; kids who started low stayed low.

Language and adaptive scores each predicted their own future better than anything else.

Clarke et al. (2025) followed people into adulthood and added a twist.

For autistic clients with IQ under 70, personal care skills still rule.

For those with IQ over 70, community skills like shopping or bus riding matter more.

Richman et al. (2001) sounds like it clashes—they say autism lowers adaptive scores below IQ.

The gap is real, but both papers agree: once you know the starting point, you can map the path.

Ben-Itzchak et al. (2014) tightens the rule: only toddlers with DQ 70-plus turn early gains into later adaptive growth.

Use today’s Vineland or language score as your four-year roadmap.

If the child scores under 70, pour extra hours into feeding, dressing, and toileting first.

If the child scores over 70, add community goals like ordering food or handling money.

Re-assess yearly; the 1992 data says the rank order rarely flips, so plan long-term staffing and parent training around that stable picture.