Groups Chi-square Test
Nalpuphinegp Morphine gp X2 P-value
Need for  extra dose 5(25%) 14(70%) 8.120 0.004
Pruritis 1(5%) 5(25%) 3.383 0.066
Vomiting 3(15%) 10(50%) 5.584 0.018
Need extra dose: the number of patients needed additional doses of opioids.
T-test value is an indicator of T test and X2 test value is an indicator of Chi-Square test
Table 2: The need extra dose of analgesia and the side effect profile.