After 6 months , no statistically significant differences were found between the dietetic treatment and usual care group in body weight change ( mean difference 0.78 kg , 95 % CI -0.26 -1.82 ) , QALYs ( mean difference 0.001 , 95 % CI -0.04 -0.04 ) and total costs ( mean difference 1645 , 95 % CI -525 -3547 ) .