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Health and Quality of Life Outcomes
Published in: Health and Quality of Life Outcomes 1/2016

Open Access 01-12-2016 | Research

Assessment of psychometric properties of the Brazilian version of the oral anticoagulation knowledge test

Authors: Marcus Fernando da Silva Praxedes, Mauro Henrique Nogueira Guimarães de Abreu, Saul Martins Paiva, Juliana Vaz de Melo Mambrini, Milena Soriano Marcolino, Maria Auxiliadora Parreiras Martins

Published in: Health and Quality of Life Outcomes | Issue 1/2016

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Abstract

Background

The aim of this study was to evaluate the psychometric properties of the Brazilian version of the Oral Anticoagulation Knowledge (OAK) Test.

Methods

This study, conducted in an anticoagulation clinic, included 201 Brazilian participants aged over 18 years, who had been using warfarin for more than two months. The reliability of the instrument was evaluated by assessing internal consistency (Kuder-Richardson coefficient) and reproducibility (test-retest reliability). The validity was evaluated by hypothesizing that there would be a positive correlation of moderate to strong intensity between the correctness levels of the OAK Test and time within therapeutic range (TTR) values, which is a measure used to evaluate the quality of oral anticoagulation.

Results

The instrument exhibited good psychometric properties. The total a Kuder-Richardson coefficient value was 0.818 and intraclass correlation coefficient was 0.967. The validity revealed a strong positive correlation between the values of the level of knowledge, as measured by the OAK Test and the TTR values (rs = 0.780).

Conclusion

The instrument proved to be a reliable and valid tool for evaluating the knowledge of Brazilian patients on oral anticoagulation therapy with warfarin. This instrument may be incorporated into the practice of health care for substantiating the structuring of educational activities to ensure the improvement of knowledge about the use of warfarin, thereby increasing the effectiveness and safety of treatment.
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Metadata
Title
Assessment of psychometric properties of the Brazilian version of the oral anticoagulation knowledge test
Authors
Marcus Fernando da Silva Praxedes
Mauro Henrique Nogueira Guimarães de Abreu
Saul Martins Paiva
Juliana Vaz de Melo Mambrini
Milena Soriano Marcolino
Maria Auxiliadora Parreiras Martins
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Health and Quality of Life Outcomes / Issue 1/2016
Electronic ISSN: 1477-7525
DOI
https://doi.org/10.1186/s12955-016-0498-3

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