The effective dose ( ED ( 50 ) ) values of sevoflurane were 2.44 [ 95 % confidence interval ( CI ) 2.16-2 .72 ] , 2.00 ( 95 % CI 1.78-2 .22 ) , and 1.18 ( 95 % CI 0.99-1 .36 ) for remifentanil infusion rates of 0.03 microg.kg ( -1 ) .
