ABSTRACT
It has been identified that the treatment perception is associated with adherence behaviors and the clinicalresults in chronic diseases, hence the importance of having instruments to evaluate this variable. Thiswork sought to evaluate the psychometric properties of the Spanish version of the Medication BeliefQuestionnaire (BMQ) in a clinical sample of 310 Mexican adults with asthma (74.2% women, Mage=43.98, SD= 14.712). Six structural models are compared, including the original and the adaptationto Spanish. The results show a better fit to a model of three correlated factors (Necessity, Concernand Harm) with an excellent fit (χ2= 143.791. g= 87, p >.001, CFI= .967, TLI= .961, RMSEA= .05).Evidence of convergent and criterion validity with treatment adherence was obtained, corroboratingthe relationship between positive treatment perception and adherence behaviors (r= .421, p <.001) andnegative treatment perception and non-adherence (r= -.223, p <.001). Furthermore, it was identified thatpatients with a positive treatment perception are more adherent than those with a negative treatmentperception (χ2= 13.645, p <.001, OR= 2.462 [CI= 1.518-3.991]). It is concluded that the BMQ is areliable and valid instrument to evaluate the treatment perception in Mexican patients with asthma,in addition to being sensitive to detect adherent and non-adherent patients (AU)
