The values of sufentanil consumption ( ( 43.8 21.8 ) vs ( 78.2 35.2 ) g , P < 0.01 ) , time to bowel recovery ( ( 1.2 0.4 ) vs ( 1.5 0.5 ) days , P < 0.01 ) and mean length of hospitalization ( ( 6.1 2.6 ) vs ( 7.6 2.9 ) days , P < 0.05 ) decreased significantly .