The pain score was reduced from 4.2 to 2.3 ( 95 % confidence interval , 1.3 to 3.3 ) ( P = .01 ) in the first hour and from 2.8 to 1.3 ( 95 % confidence interval , 0.6 to 1.9 ) in the sixth hour , and there was a significantly lower overall requirement for early postoperative fentanyl , reduced from a mean of 58 to 35 g ( P = .02 ) , and morphine , reduced from a mean of 10 to 6 mg ( P = .04 ) .