Table 3.

Characteristics of studies

Author	Respondents	Method	Result
Panahi et al. (2012)	100 adult female respondents (mean age 51.83 years)	A pilot, randomized, open-label clinical trial	p=0.04. There was a significant difference between the prevalence of nausea, but not vomiting, with additional ginger for standard antiemetic therapy at 6 to 24 h post chemotherapy in the ginger group, compared with the control group. However, there was no significant difference in the prevalence of nausea, vomiting between the treatment group and the control group at all intervals (mild, moderate, severe, very severe) assessed in the first 6 hours, second, third, and fourth post chemotherapy days (p >0,05).
Arslan & Ozdemir. (2015)	60 adult female respondents (mean age 48.5 years) received standard antiemetic drugs with 30 respondents (intervention group) and 30 respondents (control group).	Experimental randomized controlled trial	p <0.05. The severity of nausea and the amount of vomiting was significantly lower in the intervention group than in the control group. However, the change in the number vomiting was not statistically significant (p > 0.05) in the severity of acute nausea and the severity of delayed nausea between the intervention and control groups after the intervention.
Sanaati et al. (2016)	45 adult female respondents (20–60 years), 15 respondents (intervention group 1), 15 respondents (intervention group 2), 15 control group respondents	Randomized, double-blind and clinical trial study	p = 0.238. Ginger and chamomile are not effective on the intensity of nausea, while ginger and chamomile are both significantly effective for reducing the frequency of vomiting (p <0.0001). In addition, ginger can more effectively reduce the frequency of nausea (p = 0.006) than chamomile (p = 0.895).