Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Nausea
RCT	170 women, gestational age <16 weeks	Daily mean nausea scores (measured on a visual analogue scale: 10 cm vertical line with a scale ranging from 0 = no nausea to 10 =  severe nausea) days 1 to 7 of treatment with ginger (0.5 g twice daily) for 7 days with dimenhydrinate (50 mg twice daily) for 7 days Absolute results reported graphically	P <0.05		Not significant
Vomiting
RCT	170 women, gestational age <16 weeks	Daily mean vomiting episodes days 1 to 2 of treatment with ginger (0.5 g twice daily) for 7 days with dimenhydrinate (50 mg twice daily) for 7 days Absolute results reported graphically	P <0.05	Effect size not calculated	dimenhydrinate
RCT	170 women, gestational age <16 weeks	Daily mean vomiting episodes days 3 to 7 of treatment with ginger (0.5 g twice daily) for 7 days with dimenhydrinate (50 mg twice daily) for 7 days Absolute results reported graphically	P >0.05		Not significant