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Validity of a brazilian version of the mental status questionnaire as a screening test for dementia among elderly urban subjects. A pilot study
Author(s) -
Blay Sergio Luis,
Mari Jair De Jesus,
Ramos Luiz Roberto,
Ferraz Marcos Pacheco T.
Publication year - 1991
Publication title -
international journal of geriatric psychiatry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 129
eISSN - 1099-1166
pISSN - 0885-6230
DOI - 10.1002/gps.930061105
Subject(s) - dementia , discriminant validity , predictive validity , psychology , predictive value , test validity , psychiatry , clinical psychology , psychometrics , medicine , disease , internal consistency
Validity of the Mental Status Questionnaire (MSQ) was assessed by comparing the screening scores against a standardized psychiatric evaluation, the Clinical Interview Schedule. In a pilot study patients with dementia were divided into two subgroups: Mild and moderate/severe cases. Including patients with mild dementia in the dementia group, the best balance between sensitivity and specificity fell at cutoff point 1/2. The validity coefficients were as follows: Sensitivity 80.0%, specificity 60.5% positive predictive value 10.5%, negative predictive value 98.1%, and overall misclassification rate 38.5%Including mild dementia in the non‐dementia group, we observed that with six errors in the questionnaire the validity coefficients for moderate/severe dementia were: sensitivity 100.0%, specificity 94.4%, positive predictive value 16.7%, negative predictive value 100.0%, overall misclassification rate 5.5%. A discriminant analysis was run in order to select the most discriminant MSQ items for detecting dementia. Factors associated with misclassification in the questionnaire were investigated.