Table 2.

Comparison of the incidence of PONV between the two groups of patients at various time periods after operation (n, %, n = 53).

Group	0–6 h	6–12 h	12–24 h	24–48 h
Control group	22 (41.5)	25 (47.2)	18 (34.0)	5 (9.4)
Experimental group	9 (17.0)	11 (20.8)	6 (11.3)	0 (0)
χ 2	7.705	8.244	7.756	5.248
P	0.006	0.004	0.005	0.022