The groups received similar volumes of enteral nutrition solution [ 1221 mL/d ( 95 % CI : 1120 , 1322 mL/d ) compared with 1259 mL/d ( 95 % CI : 1143 , 1374 mL/d ) ; P = 0.628 ] , which led to a 46 % increase in daily calories in the group given the 1.5-kcal / mL solution [ 1832 kcal/d ( 95 % CI : 1681 , 1984 kcal/d ) compared with 1259 kcal/d ( 95 % CI : 1143 , 1374 kcal/d ) ; P < 0.001 ] .