The scores of Ramsay Sedation Scale in group S at AH 2 , 6 , 12 , 24 , and 48 were respectively ( 3.2 0.6 ) , ( 3.2 0.5 ) , ( 3.3 0.7 ) , ( 3.2 0.4 ) , and ( 3.3 0.4 ) points , which were higher than those in group DS [ ( 2.4 0.6 ) , ( 2.5 0.5 ) , ( 2.4 0.6 ) , ( 2.4 0.4 ) , and ( 2.4 0.5 ) points , with t values from 5.302 to 8.391 , P values below 0.001 ] .