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- W2127915776 abstract "The Montreal Cognitive Assessment (MoCA) is a brief screening test that samples a broad range of cognitive domains and is sensitive to Mild Cognitive Impairment (MCI) and Alzheimer's dementia (AD). A prior study examined its psychometric properties using one-parameter Rasch analysis (Koski et al., 2009), concluding that the MoCA is a reliable quantitative estimate of global cognitive ability with items that are sufficiently difficult for use in a geriatric clinical setting. Here, we seek to replicate those findings using a more flexible two-parameter item response theory (IRT) analysis and to investigate whether certain items are differentially difficult or discriminating by sex, education, or diagnosis. 275 participants (age = 72.3 ± 9.5, range = 50.9-93.5; 52.4% Female; 90.4% White; years of education = 16.5 ± 2.7) completed the MoCA as part of a longitudinal research study at the UCLA-ADRC, and were diagnosed as Normal Control (n=99), MCI (n=113), or AD (n=63) by consensus. We estimated a two parameter graded item response model using MoCA item-level data. Differential item functioning (DIF) was examined using the program IRTLRDIF. IRT analysis reveals that most MoCA items have: a) high factor loadings (standardized [N(0,1)] r's>0.7), suggesting that most are correlated well with the latent trait (Fig. A, y-axis), and b) a desirable spread in item difficulty (Fig. A, x-axis). DIF analysis of sex was significant for items Serial 7 and Contour (Figs. B-D): males were more likely to provide correct responses to Serial 7 regardless of cognitive ability, while females were more likely to provide correct responses to Contour except in lower levels of cognitive ability. DIF analysis of years of education was significant for City; individuals with >12 years of education were more likely to provide correct responses regardless of cognitive ability. We found no DIF by diagnosis." @default.
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- W2127915776 date "2014-07-01" @default.
- W2127915776 modified "2023-09-26" @default.
- W2127915776 title "P2-233: ITEM RESPONSE THEORY ANALYSIS OF THE MONTREAL COGNITIVE ASSESSMENT" @default.
- W2127915776 doi "https://doi.org/10.1016/j.jalz.2014.05.910" @default.
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