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Sex significantly predicts medial temporal volume when controlling for the influence of ApoE4 biomarker and demographic variables: A cross-ethnic comparison

Published online by Cambridge University Press:  30 June 2023

Patricia Garcia*
Affiliation:
Department of Clinical Neurology, Indiana University School of Medicine, Indianapolis, IN, USA
Lisandra Mendoza
Affiliation:
Bay Pines VA Healthcare System, Bay Pines, FL, USA
Dilianna Padron
Affiliation:
Albizu University–Miami Campus, Miami, FL, USA
Andres Duarte
Affiliation:
Albizu University–Miami Campus, Miami, FL, USA
Ranjan Duara
Affiliation:
Mount Sinai Medical Center, Miami Beach, FL, USA
David Loewenstein
Affiliation:
University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
Maria Greig-Custo
Affiliation:
Mount Sinai Medical Center, Miami Beach, FL, USA
Warren Barker
Affiliation:
Mount Sinai Medical Center, Miami Beach, FL, USA
Rosie Curiel
Affiliation:
University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
Monica Rosselli
Affiliation:
Department of Psychology, Florida Atlantic University, Davie, FL, USA
Miriam Rodriguez
Affiliation:
Department of Health & Wellness Design, Indiana University Bloomington School of Public Health, Bloomington, IN, USA
*
Corresponding author: Patricia Garcia; Email: patgarc@iu.edu

Abstract

Objective:

To explore the relationship between age, education, sex, and ApoE4 (+) status to brain volume among a cohort with amnestic mild cognitive impairment (aMCI).

Method:

One hundred and twenty-three participants were stratified into Hispanic (n = 75) and White non-Hispanic (WNH, N = 48). Multiple linear regression analyses were conducted with age, education, sex, and ApoE4 status as predictor variables and left and right combined MRI volumes of the hippocampus, parahippocampus, and entorhinal cortex as dependent variables. Variations in head sizes were corrected by normalization with a total intracranial volume measurement.

Results:

Bonferroni-corrected results indicated that when controlling for ApoE4 status, education, and age, sex was a significant predictor of hippocampal volume among the Hispanic group (β = .000464, R2 = .196, p < .01) and the WNH group (β = .000455, R2 = .195, p < .05). Education (β = .000028, R2 = .168, p < .01) and sex (β = .000261, R2 = .168, p < .01) were significant predictors of parahippocampal volume among the Hispanic MCI group when controlling for the effects of ApoE4 status and age. One-way ANCOVAs comparing hippocampal and parahippocampal volume between males and females within groups revealed that females had significantly larger hippocampal volumes (p < .05). Hispanic females had significantly larger hippocampal (p < .001) and parahippocampal (p < .05) volume compared to males. No sex differences in parahippocampal volume were noted among WNHs.

Conclusions:

Biological sex, rather than ApoE4 status, was a greater predictor of hippocampal volume among Hispanic and WNH females. These findings add to the mixed literature on sex differences in dementia research and highlight continued emphasis on ethnic populations to elucidate on neurodegenerative disparities.

Type
Research Article
Copyright
Copyright © INS. Published by Cambridge University Press 2023

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