Table 4.

Comparison of the anesthesia levels of subjects between two groups [$\overline{x}\pm s$, n(%)].

Group	Sensory block		Motor block
	Onset time (s)	Duration (min)	Onset time (s)	Duration (min)
Observation group	69.7 ± 7.1	113.5 ± 7.2	161.2 ± 17.3	162.2 ± 20.1
Control group	55.3 ± 9.2	132.7 ± 6.2	154.5 ± 16.7	211.3 ± 19.7
t/χ2	2.222	2.009	0.527	2.462
P	0.024	0.042	0.643	0.013