Use of three depression scales for evaluation of pretreatment severity and of improvement after treatment.

We investigated the Castilian Spanish versions of three scales (the Hamilton Rating Scale for Depression, the Carroll Rating Scale for Depression, and the Montgomery-Asberg Depression Rating Scale) as to their suitability for classifying major depression patients in four levels of severity prior to treatment with tricyclic antidepressants, and also as to their suitability for classifying these patients in four improvement levels when administered posttreatment. Although the scales behaved quite similarly, each was most efficient at the task for which it had been designed, i.e., severity rating for the Hamilton and Carroll scales, improvement rating for the Montgomery-Asberg scale.