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[Development and Psychometric Evaluation of the "Freiburger Fragebogen zur Medikamentenadhärenz (FF-MedAd)" in a Sample of Rehabilitation Patients with Cardiovascular Diseases].

PURPOSE
The aim of this study was the development and psychometric evaluation of a questionnaire which measures barriers and facilitators of medication adherence of patients with cardiovascular diseases in medical rehabilitation.


METHODS
A total of 133 inpatients in medical rehabilitation returned the questionnaire in a cross-sectional study in one center of cardiological rehabilitation. The dimensional analysis of the instrument was conducted by explorative factor analysis (EFA).


RESULTS
The questionnaire "Freiburger Fragebogen zur Medikamentenadhärenz (FF-MedAd)" consists of 30 items distributed among 8 factors. Five of these factors represent barriers (e. g. forgetting/interchanging) and 3 facilitators (e. g. trust, communication) of medication adherence. Five scales have acceptable to good internal consistency with Cronbachs α between 0.72 and 0.87. Three scales were just below the acceptable range (0.61-0.67). Correlations between the FF-MedAd scales indicate the factorial validity of the questionnaire.


CONCLUSION
The psychometric results of the FF-MedAd to measure self-estimated medication adherence of patients with cardiovascular diseases were satisfactory.