Study of Internal Consistency and Factor Structure of Three Versions of the Zung's Rating Instrument for Anxiety Disorders/Estudio de la Consistencia Interna y Estructura Factorial de Tres Versiones de la Escala de Zung Para Ansiedad (Report‪)‬

The Diagnostic and Statistical Manual for Mental Disorders (DSM-IV-TR) of the American Psychiatric Association (APA) defines anxiety as the apprehensive anticipation of a further damage or misfortune; it is associated with dysphoria and somatic tension (1). Anxiety is considered a basic psychobiological emotion, a normal adaptive answer for threats or stressors, conditioning the performance of persons. If the answer is excessive is thought as a desadaptive behavior (2).