Key result
Adapted Measurement of Treatment Adherence instrument shows weak validity and reliability for oral anticoagulation users.
Why the study?
The Measurement of Treatment Adherence (MTA) instrument required adaptation and validation for Brazilian users of oral anticoagulation therapy.
The adapted Measurement of Treatment Adherence instrument showed weak validity and reliability for Brazilian patients on oral anticoagulation.
Weak performance precludes clinical use of this adherence instrument; leaves open validation of alternatives for anticoagulation therapy.
This methodological study adapted and analyzed the psychometric properties of the Measurement of Treatment Adherence (MTA) instrument for Brazilian users of oral anticoagulation therapy. Its final version was tested with 178 individuals. The average of answers for all questions ranged from 4.6 to 5.8 and 97.2% of the individuals were considered adherent. Moderate correlations were obtained between the adherence measure and the Mental health and Vitality domains of the SF-36. Cronbach's alpha was 0.60 and the ceiling effect occurred in answers to all items. These results indicate weak evidence of the validity, reliability and responsiveness of the MTA-adapted version for users of oral anticoagulant therapy.
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Carvalho et al. (2010) studied Oral anticoagulation therapy (n=178). Measurement of Treatment Adherence (MTA) instrument was evaluated on Psychometric properties (validity, reliability, and responsiveness). The adapted Measurement of Treatment Adherence instrument showed weak validity, reliability, and responsiveness for oral anticoagulation therapy users, with a Cronbach's alpha of 0.60.
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