Resumen

MARTIN ALFONSO, Libertad; BAYARRE VEA, Héctor D  y  GRAU ABALO, Jorge A. Validation of MBG Questionnaire (Martin-Bayarre-Grau) for the evaluation of therapy adherence in blood hypertension patients. Rev Cubana Salud Pública [online]. 2008, vol.34, n.1. ISSN 0864-3466.

Introduction A research project aimed at evaluating the levels of adherence to treatment in hypertensive persons is being conducted in the National School of Public Health of Cuba; to this end, the construction and validation of a questionnaire in order to measure this aspect were required. Objectives To present the process of validation of contents and the logical construction of the questionnaire as well as the evaluation of its internal consistency. Methods Contents validation was carried out using a methodology submitted by Moriyama. The sample used to evaluate internal reliability and validity of the internal construction of MBG questionnaire was made up of patients with essential blood hypertension, aged over 20 years and living in the health area under Van Troi polyclinics (N: 114) in Centro Habana municipality. Internal consistency was determined by Cronbach` s alpha coefficient estimation whereas validity of MBG construction was evaluated by a factor analysis of main components. Results Cronbach´s alpha coefficient of internal consistency was 0,889 for the sample. The contents validation allowed considering that the formulation of items was reasonable, they were clearly defined and their presence in the questionnaire was justified; the submitted categories to be included in the construction of this instrument were adequate. The results indicated the existence of three factors: active adherence, autonomy in the face of treatment and adherence complexity, all of which accounted for 68,72% of accrued variance. Conclusions The achieved results were favourable. An instrument comprising adequate conditions and valid criteria that support its use and application in the field of research and of medical practice is available

Palabras clave : Therapy adherence; treatment adherence; validation; questionnaire; blood hypertension.