Table 1.

Demographic characteristics of patients

Demographic characteristic	Group A (n = 31)a	Group B (n = 30)a	t value	P value
Age (years)	35.87 ± 9.10	37.87 ± 10.10	− 0.811	0.420
Height (cm)	161.68 ± 5.26	159.53 ± 4.95	1.640	0.106
Weight (kg)	56.66 ± 6.35	53.92 ± 5.58	1.791	0.078
Body mass ndex	21.66 ± 1.80	21.11 ± 1.67	1.241	0.220

Data are presented as the mean ± standard deviation.(SD). No significant differences were found between the two groups with respect to these characteristics

^aPatients were administered 0.1 μg/kg nalbuphine (group A) or 0.2 μg/kg nalbuphine (group B) intravenously 3 min before endoscopic placement