Table 3.

Postoperative pain in the four groups ($\overline{x}$ ± s).

Group	1 h	2 h	4 h	12 h	24 h	48 h
Group A	2.6 ± 0.4	3.2 ± 0.6	3.4 ± 0.6	3.1 ± 0.7	2.3 ± 0.6	1.9 ± 0.8
Group B	2.3 ± 0.5*	2.7 ± 0.7*	2.7 ± 0.7	2.6 ± 0.5	2.2 ± 0.8	1.8 ± 0.7
Group C	2.4 ± 0.3**	2.1 ± 0.4**	2.2 ± 0.4**	1.7 ± 0.4**	1.9 ± 0.5**	1.5 ± 0.6**
Group D	1.7 ± 0.7***	1.6 ± 0.6***	1.5 ± 0.6***	1.4 ± 0.5***	1.3 ± 0.3***	1.1 ± 0.3***

^*P < 0.05 compared to Group A.

^**P < 0.05 compared to Group B.

^***P < 0.05 compared to Group C.