Table 3.

Comparison of postoperative complications of the three groups

Parameter	S group	SD1 group	SD2 group	p value
Pressing frequency	5.1 ± 1.2	4.6 ± 1.0	10.5 ± 3.1*#	0.011
Nausea and vomiting: case (%)	6(21.43)	1(3.33)*	1(3.44)*	0.025
Bradycardia: case (%)	0(0)	0(0)	0(0)	–
Respiratory depression: case (%)	3(10.71)	0(0)*	0(0)*	0.038
Excessive sedation: case (%)	0(0)	0(0)	0(0)	–

*Indicated that compared with group S, p < 0.05; ^#indicated that compared with group SD1, p < 0.05