TY - JOUR
T1 - Reading ability as an estimator of premorbid intelligence
T2 - Does it remain stable in emergent dementia?
AU - Schmand, Ben
AU - Geerlings, Mirjam I.
AU - Jonker, Cees
AU - Lindeboom, Jaap
PY - 1998/7/20
Y1 - 1998/7/20
N2 - The 6-year stability of reading performance was investigated in subjects who were normal at baseline but suspect for dementia at follow-up (MMSE score ≤ 23; n = 197), and in a cognitively intact control group (n = 117). The Dutch version of the National Adult Reading Test (DART) was used. The DART- based estimate of IQ appeared to be very stable in healthy elderly. In the 'suspect' group, the decline after 6 years was about 3 IQ-points in subjects who were still not demented, minimally demented, or mildly demented. Reliability remained satisfactory in these subgroups. In cases with moderate and severe dementia, the decline was considerable (≤15 IQ points). The decline of DART IQ was related to deterioration of semantic memory as reflected in verbal abstraction and category fluency. It is concluded that the DART remains a valid estimator of premorbid verbal intelligence in mild and questionable dementia. A formula is presented which can correct the underestimation on the basis of the MMSE score.
AB - The 6-year stability of reading performance was investigated in subjects who were normal at baseline but suspect for dementia at follow-up (MMSE score ≤ 23; n = 197), and in a cognitively intact control group (n = 117). The Dutch version of the National Adult Reading Test (DART) was used. The DART- based estimate of IQ appeared to be very stable in healthy elderly. In the 'suspect' group, the decline after 6 years was about 3 IQ-points in subjects who were still not demented, minimally demented, or mildly demented. Reliability remained satisfactory in these subgroups. In cases with moderate and severe dementia, the decline was considerable (≤15 IQ points). The decline of DART IQ was related to deterioration of semantic memory as reflected in verbal abstraction and category fluency. It is concluded that the DART remains a valid estimator of premorbid verbal intelligence in mild and questionable dementia. A formula is presented which can correct the underestimation on the basis of the MMSE score.
UR - http://www.scopus.com/inward/record.url?scp=0031849615&partnerID=8YFLogxK
U2 - 10.1076/jcen.20.1.42.1485
DO - 10.1076/jcen.20.1.42.1485
M3 - Article
C2 - 9672818
AN - SCOPUS:0031849615
SN - 1380-3395
VL - 20
SP - 42
EP - 51
JO - Journal of Clinical and Experimental Neuropsychology
JF - Journal of Clinical and Experimental Neuropsychology
IS - 1
ER -