![]() The construct reliability of the original MoCA was not optimal and could be improved by deleting one subdomain (Naming) and five items, namely Clock Circle, Lion, Digit Forward, Repeat 2nd Sentence, and Place, which showed inadequate loadings on their latent vectors. We recruited 181 participants, namely 60 healthy controls, 61 aMCI, and 60 AD patients. ![]() The aims of this study were to a) evaluate the construct validity of the MoCA and its subdomains or whether the MoCA can be improved by feature reduction, and b) develop a short version of the MoCA (MoCA-Brief) for the Thai population. The Montreal Cognitive Assessment (MoCA) rating scale is frequently used to assess cognitive impairments in amnestic mild cognitive impairment (aMCI) and Alzheimer's disease (AD). The MoCA has proved to be an appropriate measure for cognitive screening taking into account different cognitive domains, which will enable clinicians and researchers to use this test and its six latent dimensions to achieve a better understanding of the individuals' cognitive profile. The present findings corroborate the six-dimensional structure of the MoCA and provide good evidence of the construct related validity. This study contributes to overcome an important gap in the construct related validity of this instrument. An overall psychometric adequacy of the items, and a good reliability were also found. The results allowed us to establish the factorial, convergent, and discriminant validity of this six-dimensional structure. Although all tested models showed a good fit, the six-factor model based on the conceptual model proposed by the MoCA's authors showed a significantly better fit. In a Portuguese sample of 830 participants, several models were tested using Confirmatory Factor Analysis. The present study aims to assess the construct related validity of the MoCA through the establishment of the factorial, convergent, and discriminant related validities, and the reliability of data. The Montreal Cognitive Assessment (MoCA) is a brief instrument developed for the screening of milder forms of cognitive impairment.
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