The mean scores at the end of the 6-week treatment period were lower for the ECT group than for the pharmacological treatment group : by 6.6 points on the Montgomery-sberg Depression Rating Scale ( SE = 2.05 , 95 % CI = 2.5-10 .6 ) , by 9.4 points on the 30-item version of the Inventory of Depressive Symptomatology-Clinician-Rated ( SE = 2.49 , 95 % CI = 4.6-14 .3 ) , and by 0.7 points on the Clinical Global Impression for Bipolar Disorder ( SE = 0.31 , 95 % CI = 0.13-1 .36 ) .