The Peabody Picture Vocabulary Test-Revised (PPVT-R) was examined as an est
imate of premorbid intelligence in a clinical sample of elderly patients (N
= 150) undergoing clinical neuropsychological evaluation. PPVT-R standard
scores were compared across grossly cognitively intact, mildly/ moderately
and severely impaired groups of patients, and compared to a short form of t
he Wechsler Adult Intelligence Scale-Revised (WAIS-R) and the Barona regres
sion equation. Results indicate that, while the PPVT-R is vulnerable to inc
reasing levels of cognitive impairment among patients with fewer years of e
ducation, the PPVT-R is stable across mild to moderate levels of impairment
for patients with greater than 12 years of education. In a sub-sample of g
rossly cognitively intact patients (n = 91), the PPVT-R standard score corr
elated significantly with estimated WAIS-R FSIQ (r = .61). Compared to the
Barona equation, the PPVT-R was less likely to over-estimate WAIS-R FSIQ in
the grossly cognitively intact patients. These data suggest the PPVT-R to
be a useful estimate of premorbid ability for patients with a greater than
high-school education.