Table 2. Comparison of the complete prevention rate of nausea (CP) between the two groups in each stage.

Study endpoint	Megestrol group (n=60), n (%)	Control group (n=60), n (%)	RR (95% CI)	χ2	P
Delay period (24–120 h)	31/60 (53.3)	18/60 (30.0)	1.751 (1.110–2.764)	6.241	0.012
Acute phase (0–24 h)	42/60 (70.0)	39/60 (65.0)	1.077 (0.840–1.381)	0.342	0.559
Overall period	24/60 (40.0)	9/60 (15.0)	2.667 (1.355–5.250)	9.404	0.002

P value was calculated by using χ² to test the nausea free ratio (CP). CP, complete prevention rate; RR, risk ratio.