Table 2.

Begg's test and Egger's test for each study endpoints.

Study endpoints	P value of Egger's test	P value of Begg's test
Nausea	0.958	0.851
Vomiting	0.599	0.881
Itching	0.224	0.142
Dizzy	0.333	0.188
12 h VAS	0.012	0.035
24 h VAS	0.026	0.216
48 h VAS	0.018	0.015
12 h RSS	0.025	0.042
24 h RSS	0.025	0.042