Scores on the Hamilton Rating Scale for Depression Before, During and Following the Treatment Course. A repeated measures analysis of covariance on serial depression severity ratings used pulse width and electrode placement conditions and their interaction as between-subject terms, and age, preECT depression score, and number of adequate medication trials as covariates. In this omnibus analysis depression severity over time varied with the pulse width and electrode placement conditions, as well as their interaction (P’s<0.05). Post hoc analyses indicated that each time point, the ultrabrief bilateral ECT group had inferior outcome relative to the other three groups (P’s <0.05), none of which differed from each other.