There were statistically significant differences in the number of children requiring rescue morphine administration ( 13 of 16 receiving transversus abdominis plane block and 6 of 16 receiving regional field infiltration , p = 0.011 ) , mean SD total morphine consumption ( 0.066 0.051 vs 0.028 0.040 mg/kg , p = 0.021 ) and mean SD pain scores ( 5 5 vs 2 3 , p = 0.043 ) in the recovery room , in favor of surgeon administered regional field infiltration .