Scores gradually improved in the intervention group , with a significant difference seen at 6months ( T1-T3 Mean difference = -1.5 , ( CI 0.87-2 .25 ) P < 0.005 ] Follow-up questionnaires , 6months after the intervention was removed , T4 , showed sustained significant difference between the groups ( control M = 3.0 ; intervention M = 1.1 [ t = -4.113 , P < 0.05 ] ) .