The magnitude of the change was large in total mood disturbance ( difference between groups -7.1 ; standardized effect-size [ SES ] 1.15 ) and mindfulness ( difference between groups 11 ; SES 0.9 ) and moderate in the burnout ( difference between groups -7 ; SES 0.74 ) and empathy scales ( difference between groups 5.2 ; SES 0.71 ) .