Stanford-Binet & WAIS IQ Differences and Their Implications for Adults with Intellectual Disability (aka Mental Retardation).

Stanford-Binet and Wechsler Adult Intelligence Scale (WAIS) IQs were compared for a group of 74 adults with intellectual disability (ID). In every case, WAIS Full Scale IQ was higher than the Stanford-Binet Composite IQ, with a mean difference of 16.7 points.

Incidence and prevalence of dementia in elderly adults with mental retardation without down syndrome.

Rates of dementia in adults with mental retardation without Down syndrome were equivalent to or lower than would be expected compared to general population rates, whereas prevalence rates of other chronic health concerns varied as a function of condition. Given that individual differences in vulnerability to Alzheimer's disease have been hypothesized to be due to variation in cognitive reserve, adults with mental retardation, who have long-standing intellectual and cognitive impairments, should be at increased risk. This suggests that factors determining intelligence may have little or no direct relationship to risk for dementia and that dementia risk for individuals with mental retardation will be comparable to that of adults without mental retardation unless predisposing risk factors for dementia are also present.

Dementia in adults with mental retardation: assessment at a single point in time.

Dementia status of 273 adults with mental retardation was rated based upon two extensive evaluations conducted 18 months apart. Overall, 184 individuals did not have dementia, 33 had possible or definite dementia, and 66 had findings suggesting uncertain or questionable status. These ratings were compared to binary classifications (dementia vs.