Length of stay ( 7.3 vs 7.0 days ; mean difference , 0.3 days ; 95 % CI , -0.6 to 1.1 ) , readmission within 30 days ( 3.3 % vs 4.1 % ; difference , -0.7 % ; 95 % CI , -4.2 % to 2.7 % ) , and severe complications ( 22.5 % vs 22.1 % ; difference , 0.4 % ; 95 % CI , -4.2 % to 2.7 % ) did not differ significantly .