Validity of the Katz Index to assess activities of daily living by informants in neuropathological studies

  • Renata Eloah de Lucena Ferretti-Rebustini University of Quebec in Trois-Rivières; Department of Psychology; Laboratory of Psychometric and Experimental Methods
  • Marcos Alencar Abaide Balbinotti University of Quebec in Trois-Rivières; Department of Psychology; Laboratory of Psychometric and Experimental Methods
  • Wilson Jacob-Filho Universidade de São Paulo; Faculdade de Medicina
  • Flávio Rebustini Universidade Estadual Paulista; Instituto de Biociências; Laboratório de Estudos e Pesquisas em Psicologia do Esporte
  • Claudia Kimie Suemoto Universidade de São Paulo; Faculdade de Medicina
  • Carlos Augusto Gonçalves Pasqualucci Serviço de Verificação de Óbitos da Capital
  • José Marcelo Farfel Universidade de São Paulo; Faculdade de Medicina
  • Renata Elaine Paraizo Leite Universidade de São Paulo; Faculdade de Medicina; Laboratório de Fisiopatologia no Envelhecimento
  • Lea Tenenholz Grinberg University of California; Department of Neurology; Memory and Aging Center
  • Ricardo Nitrini Universidade de São Paulo; Faculdade de Medicina; Departamento de Neurologia

Abstract

OBJECTIVE To analyze the evidences of construct validity of the Katz Index for the retrospective assessment of activities of daily living (ADL) by informants, to assist neuropathological studies in the elderly. METHOD A cross-sectional study analyzed the functional ability of ADL measure by the Katz Index, of 650 cases randomly selected from the Brazilian Brain Bank of the Ageing Brain Study Group (BBBABSG) database. Sample was divided in two subsamples for the analysis (N=325, each) and then stratified according to cognitive decline assessed by the Clinical Dementia Rating Scale (CDR). Factor analyses with calculations of internal consistency and invariance were performed. RESULTS Factor analysis evidenced a unidimensional instrument with optimal internal consistency, in all subgroups. Goodness of fit indices were obtained after two treatments of covariance, indicating adequacy of the scale for assessing ADL by informants. The scale is invariant to cognitive decline meaning that it can be used for subjects with or without cognitive impairment. CONCLUSION Katz Index is valid for the retrospective assessment of basic ADL by informants, with optimal reliability.

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Published
2015-12-01
How to Cite
Ferretti-Rebustini, R., Balbinotti, M., Jacob-Filho, W., Rebustini, F., Suemoto, C., Pasqualucci, C., Farfel, J., Leite, R., Grinberg, L., & Nitrini, R. (2015). Validity of the Katz Index to assess activities of daily living by informants in neuropathological studies . Revista Da Escola De Enfermagem Da USP, 49(6), 944-950. https://doi.org/10.1590/S0080-623420150000600010
Section
Original Articles