Fig. 5. Effect of anesthetic depth on the amplitude of phasic and tonic genioglossus electromyogram (EMGgg) activity while subjects were breathing at a maintenance pressure (  i.e. , no evidence of inspiratory flow limitation). Results are expressed as box and whisker plots, including median, 5th, 25th, 75th, and 95th percentiles. *  P < 0.05  versus 1.0 μg/ml propofol.