Weight loss and % EWL at 12 months was greater in smaller pouch size group ( mean 15.8 kg , 95 % CI -17.2 to -14.4 and mean 68.9 , 95 % CI 62.5-75 .2 % ) than in larger pouch size group ( mean -13.7 kg , 95 % CI -15.3 to -12.1 , and mean 59.1 , 95 % CI 52.8-65 .5 ) ( P = 0.046 , P = 0.033 , respectively ) .