Table 1. Demographic Characteristics of Patients in the Two Groups .

	Dextromethorphan (n = 54)	Placebo (n = 58)	P value
Age, mean (SD), y	28.1 ± 8.6	30.2 ± 7.5	0.1
Frequency of males, %	(66.7) 36	(63.8) 37	0.7
ASA status, % a
ASA I	(70.4) 38	(77.6) 45	0.3
ASA II	(29.6) 16	(22.4) 13	0.3

^aAbberviations: ASA, acetylsalicylic acid.