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Predictors of Retest Effects in a Longitudinal Study of Cognitive Aging in a Diverse Community-Based Sample

  • Alden L. Gross (a1), Andreana Benitez (a2), Regina Shih (a3), Katherine J. Bangen (a4), M. Maria M. Glymour (a5), Bonnie Sachs (a6), Shannon Sisco (a7), Jeannine Skinner (a8), Brooke C. Schneider (a9) and Jennifer J. Manly (a10)...


Better performance due to repeated testing can bias long-term trajectories of cognitive aging and correlates of change. We examined whether retest effects differ as a function of individual differences pertinent to cognitive aging: race/ethnicity, age, sex, language, years of education, literacy, and dementia risk factors including apolipoprotein E ε4 status, baseline cognitive performance, and cardiovascular risk. We used data from the Washington Heights-Inwood Columbia Aging Project, a community-based cohort of older adults (n=4073). We modeled cognitive change and retest effects in summary factors for general cognitive performance, memory, executive functioning, and language using multilevel models. Retest effects were parameterized in two ways, as improvement between the first and subsequent testings, and as the square root of the number of prior testings. We evaluated whether the retest effect differed by individual characteristics. The mean retest effect for general cognitive performance was 0.60 standard deviations (95% confidence interval [0.46, 0.74]), and was similar for memory, executive functioning, and language. Retest effects were greater for participants in the lowest quartile of cognitive performance (many of whom met criteria for dementia based on a study algorithm), consistent with regression to the mean. Retest did not differ by other characteristics. Retest effects are large in this community-based sample, but do not vary by demographic or dementia-related characteristics. Differential retest effects may not limit the generalizability of inferences across different groups in longitudinal research. (JINS, 2015, 21, 506–518)


Corresponding author

Correspondence and reprint requests to: Alden L. Gross, Johns Hopkins Bloomberg School of Public Health, 2024 E. Monument St., Baltimore, MD 21205, USA. E-mail:


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Appendix Tables 1-3

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Predictors of Retest Effects in a Longitudinal Study of Cognitive Aging in a Diverse Community-Based Sample

  • Alden L. Gross (a1), Andreana Benitez (a2), Regina Shih (a3), Katherine J. Bangen (a4), M. Maria M. Glymour (a5), Bonnie Sachs (a6), Shannon Sisco (a7), Jeannine Skinner (a8), Brooke C. Schneider (a9) and Jennifer J. Manly (a10)...


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