Table 2. Severity of Postoperative Pain in the Two Groups .

	Dextromethorphan Group(n = 54) a	Placebo Group (n = 58) a	P value
In the recovery room	4.1 ± 1.8	4.7 ± 1.2	0.05
4 hours postoperation	2.9 ± 0.9	3.8 ± 1.1	0.001
8 hours postoperation	2.7 ± 0.7	3.4 ± 0.6	0.001
12 hours postoperation	2.4 ± 0.6	2.5 ± 0.7	0.381
16 hours postoperation	0.9 ± 0.6	1.2 ± 0.7	0.09

^a Mean ± SD