RESULTS	The correlation coefficients ( bias + / - SD ; percentage error ) between the BIS vs. spectral state entropy and response entropy were r ( 2 ) = 0.56 ( 1 + / -11 ; 42 % ) and r ( 2 ) = 0.58 ( -2 + / -11 ; 43 % ) under normothermic conditions , and r ( 2 ) = 0.17 ( 10 + / -12 ; 77 % ) and r ( 2 ) = 0.18 ( 9 + / -11 ; 68 % ) under hypothermic conditions , respectively .\