Validation of ketogenic diet adherence questionnaire: Keto-check

 

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Abstract

Background The ketogenic diet is a therapeutic option to control drug-resistant epileptic seizures and has difficult compliance standards due to adverse effects, psychosocial factors, or dietary restriction.

Objective To create and validate a ketogenic diet compliance questionnaire.

Methods Methodological study, convergent care. The instrument was analyzed (construct validation) by five judges during two cycles of the Delphi technique. The judges assessed the relevance and clarity by using the Likert scale with three levels and made suggestions. The validation of the instrument was calculated using the agreement rate and content validity index (CVI). The application by two nutritionists made it possible to test reproducibility using the Kappa coefficient. When comparing the classification with a template developed by the health professionals who cared for the patients in question, the Pearson correlation and Fisher exact tests were used. For the reliability test, self-applied data were collected and evaluated using Cronbach Alpha coefficient.

Results The questionnaire initially created with 11 multiple choice questions on a Likert scale was reduced to 10 questions with an agreement rate and the CVI classified as excellent after two rounds with judges. In the application of the tool, a kappa of 0.6087 was obtained, a Pearson that showed no significant difference between evaluators and a Cronbach α of 0.6483, with substantial consistency.

Conclusions This work resulted in the creation of an unprecedented and reliable questionnaire on adherence to the national ketogenic diet. Further studies should be performed to extrapolate the use of this questionnaire in different populations.

Resumo

Antecedentes A dieta cetogênica é um tratamento para epilepsia refratária e tem difícil adesão devido aos efeitos adversos, fatores psicossociais ou à própria restrição alimentar.

Objetivo Criar e validar um questionário de adesão à dieta cetogênica.

Métodos Estudo metodológico, convergente assistencial. O instrumento foi analisado (validação de constructo) por cinco juízes durante dois ciclos da técnica Delphi. Os juízes avaliaram a pertinência e a clareza com respostas na escala Likert com três níveis, além de sugestões. A validação do instrumento foi calculada pela taxa de concordância e índice de validade de conteúdo (IVC). Posteriormente, houve aplicação por duas nutricionistas (reprodutibilidade), sendo analisada a concordância pelo coeficiente de Kappa. Ao comparar a classificação com um gabarito, elaborado pelos profissionais da saúde responsáveis pelos pacientes em questão, foram utilizados os coeficientes de correlação de Pearson e teste exato de Fisher. Para teste de fidedignidade, a coleta de dados auto-aplicados foi avaliada pelo coeficiente de Alpha de Cronbach.

Resultados O questionário inicialmente criado com 11 questões de múltipla escolha em escala Likert foi reduzido para 10 questões com taxa de concordância e IVC excelentes após 2 rodadas com juízes. Na aplicação da ferramenta obteve-se coeficiente de Kappa de 0,6087, o coeficiente de Pearson não demostrou diferença significativa entre avaliadores, e o coeficiente α de Cronbach de 0,6483, com consistência substancial.

Conclusões Este trabalho resultou na criação do inédito questionário nacional de adesão à dieta cetogênica, válido e fidedigno. Outros estudos devem ser realizados para extrapolar a utilização deste questionário em diferentes populações.

Authors' Contributions

LCLN: hypothesis generation, methodological design, data collection, data analysis, article writing, article revision; LPBS: Hypothesis generation, methodological design, article writing, article revision.

Publication History

Received: 24 May 2021

Accepted: 22 December 2021

Article published online:
17 October 2022

© 2022. Academia Brasileira de Neurologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution 4.0 International License, permitting copying and reproduction so long as the original work is given appropriate credit (https://creativecommons.org/licenses/by/4.0/)

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