The intervention ( n = 133 ) was significantly more effective than no intervention ( n = 151 ) concerning self-reported adherence and knowledge with mean differences in change scores ( 95 % CI ) at T1 and T2 being 1.4 ( 0.7-2 .0 ) and 0.9 ( 0.2-1 .7 ) for adherence and 6.8 ( 4.5-9 .1 ) and 3.9 ( 1.7-6 .2 ) for knowledge , ( all p values < 0.005 ) .