Internal consistency and interrater reliability of the Brazilian version of Martín-Bayarre-Grau (MBG) adherence scale

Abstract

This paper aims to analyze the measurement equivalence aspects (internal consistency and interrater reliability) of a Brazilian version of Martín-Bayarre-Grau (MBG) adherence questionnaire as part of its cross-cultural adaptation. Item-total correlation and Cronbach's alpha coefficients were used as internal consistency estimates. Stability was evaluated through test and retest comparison and expressed through intraclass correlation coefficient (ICC) and kappa with quadratic weighting. ICC for the overall scale was 0.81, indicating an "almost perfect" agreement. However, some cases of "poor" and "slight" agreements were found while analyzing individual items. The translated version of the MBG questionnaire showed good homogeneity (alpha 0.78), higher than cutoff points suggested in the literature. The scale has proved capable of measuring the level of adherence to treatment in hypertensive and/or diabetic patients in a reliable way.Uniterms: Adherence to medication. Reproducibility of results. Questionnaires/study. Martín-BayarreGrau/study/aspects

Measurement Properties of Patient-Reported Outcome Measures for Medication Adherence in Cardiovascular Disease: A COSMIN Systematic Review

“…Two asked about intentional reasons only [ 74 , 120 ] and one [ 73 ] asked about unintentional reasons only. Group-3: items asks about both the extent of, and reasons for, non-adherence [ 45 , 50 , 54 – 56 , 65 , 67 , 77 , 78 , 81 , 85 , 89 , 91 – 93 , 95 , 98 , 103 , 110 , 113 , 114 , 117 , 126 ]. Six MA-PROMs [ 50 , 54 , 81 , 92 , 93 , 98 ] in Group-3 were comprehensive enough to capture information on the extent of both medication-taking and prescription-filling and at least two additional domains from both intentional and unintentional reasons for non-adherence from the MAM framework [ 40 ] (Table 2 ).…”

“…Patient-reported outcome measures development was rated for the 24 original MA-PROMs [ 45 , 60 , 77 , 78 , 81 , 86 , 89 , 96 , 97 , 102 , 103 , 105 , 113 , 114 , 116 , 119 – 122 , 127 – 130 ] and 13 MA-PROMs [ 46 , 50 , 51 , 53 – 56 , 65 , 67 , 70 , 80 , 85 , 92 , 95 , 110 , 117 ] were modified versions of the original MA-PROMs. Patient-reported outcome measures development was not rated for 3 MA-PROMs [ 66 , 71 , 91 , 125 ], the development studies for two were published in a language other than English [ 71 , 91 ], and a development study could not be found for one [ 66 ]. However, all three of these original MA-PROMs were included in this review because their measurement properties had been evaluated among people with CVD.…”

“…Of the 35 studies that evaluated the content validity of an existing MA-PROM, 21 involved only patients [ 42 , 44 , 47 , 52 , 55 , 59 , 61 , 62 , 68 , 70 , 72 , 75 , 76 , 79 , 84 , 88 , 90 , 99 , 109 , 115 , 131 ], 4 involved only experts [ 67 , 89 , 103 , 124 ], and 10 involved both patients and experts [ 46 , 54 , 63 , 64 , 73 , 74 , 86 , 108 , 117 , 123 ] (Table 4 ). No studies that were not development studies were found on content validity for 21 of the identified MA-PROMs [ 45 , 50 , 51 , 56 , 60 , 66 , 71 , 78 , 80 , 85 , 91 – 93 , 96 , 97 , 105 , 110 , 113 , 119 – 121 , 125 ]. All 31 content validity studies involving patients were of doubtful quality for relevance and comprehensibility, and none evaluated the comprehensiveness aspect of the content validity.…”

Métodos para aferir a adesão à farmacoterapia em doenças crônicas: uma revisão narrativa

“…De todas as escalas de autorrelato citadas ao longo dessa revisão, apenas o BMQ 43 , a MMAS-8 53 , a SEAMS 54 e o MBG [55][56] passaram por um processo de adaptação transcultural e validação para o português do Brasil. A seção do BMQ-específico do Beliefs about Medicines Questionnaire sofreu adaptação transcultural em Portugal 57 , apesar de ter apresentado boa consistência interna e validade de construto.…”

“…A SEAMS também é uma escala mais voltada para as barreiras voltadas à autoeficácia e à confiança do paciente e não permite a identificação do real comportamento de uso do medicamento 7 . Já o MBG, apesar de ter passado por processo de adaptação transcultural e de ter apresentado boas propriedades psicométricas [55][56] , é uma escala desenvolvida para aplicação aos usuários hipertensos, o que restringe a sua utilização.…”