Vol. 16 nº 2 - Apr/May/Jun de 2022
Original Article Páginas: 171 a 180

Retest effects in a diverse sample: sociodemographic predictors and possible correction approaches

Authors Laiss Bertola1; Isabela Judith Martins Benseñor2,3; Andre Russowsky Brunoni2,3,4; Paulo Caramelli5; Sandhi Maria Barreto6; Arlinda Barbosa Moreno7; Rosane Harter Griep8; Maria Carmen Viana9; Paulo Andrade Lotufo2,3; Claudia Kimie Suemoto10

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keywords: Reproducibility of Results; Aged; Longitudinal Studies; Psychometrics.

ABSTRACT:
Repeated cognitive assessment in longitudinal studies favors the occurrence of retest effects, usually increasing the scores obtained at the follow-up assessments when compared to baseline. Therefore, retest effects can compromise the evaluation of cognitive decline in older adults.
OBJECTIVES: We aimed to verify the occurrence of the retest effect and the impact of sociodemographic characteristics on the follow-up scores in a sample of 5,592 participants with a diverse sociodemographic profile, who were assessed twice during 4 years of follow-up.
METHODS: We tested two possible approaches to correct the retest effect and calculated the Reliable Change Index.
RESULTS: We observed increased scores at the follow-up assessment after 4 years, but the results indicate a modest occurrence of retest effects. The regression difference correction successfully generated follow-up corrected scores, while the mean difference did not provide effective corrections. Sociodemographic characteristics had a minor impact on the retest.
CONCLUSIONS: We recommend the regression difference correction for retest effects. The absence of this methodological approach might lead to biased results using longitudinal cognitive scores.

 

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