Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
Systematic review	360 women, less than or equal to 17 weeks' gestation 2 RCTs in this analysis	Spontaneous abortion 5/181 (3%) with ginger 10/179 (6%) with vitamin B6	RR 0.49 95% CI 0.17 to 1.42 P = 0.19		Not significant
Systematic review	146 women Data from 1 RCT	Stillbirth 0/146 (0%) with ginger 3/145 (2%) with vitamin B6	RR 0.14 95% CI 0.01 to 2.72 P = 0.20		Not significant
Systematic review	146 women Data from 1 RCT	Congenital abnormality 3/146 (2%) with ginger 6/145 (4%) with vitamin B6	RR 0.50 95% CI 0.13 to 1.95 P = 0.32		Not significant