During maintenance , propofol consumption ( 8.2 [ 6.0 to 10.2 ] vs. 7.9 [ 7.2 to 9.1 ] mg kg h ; P = 0.89 ) was similar between the two groups , but remifentanil consumption was greater in the auto group ( 0.39 [ 0.22 to 0.60 ] vs. 0.22 [ 0.17 to 0.32 ] g kg min ; P = 0.003 ) .