For the subgroups of women , at similar BIS40-60 [ 76 ( 64-84 ) % vs 72 ( 62-82 ) % ] , propofol [ 4.7 ( 4.0-5 .8 ) vs 5.3 ( 4.5-6 .6 ) mg kg ( -1 ) h ( -1 ) , P = 0.004 ] and remifentanil [ 0.18 ( 0.13-0 .25 ) vs 0.20 ( 0.15-0 .27 ) g kg ( -1 ) min ( -1 ) , P = 0.029 ] consumptions decreased with the co-administration of N2O .