Table 1. Brief Description of the 6 Studies Included in the Meta-Analysis
StudyInterventionPlaceboDuration of StudyGestation StageOutcome Measure (Nausea and Vomiting)
Basirat et al.31500-mg ginger powder in biscuit, 5 biscuits/dayPlacebo biscuit4 days<17 weeksNausea scale (VAS) + frequency of vomiting
Ozgoli et al.35250-mg ginger capsules QIDLactose capsules4 days<20 weeksNausea scale (VAS) + frequency of vomiting
Smith et al.26350-mg ginger capsules TIDVitamin B6 (25-mg capsules)3 weeks<16 weeksNausea and vomiting scales (Rhodes Index)
Keating et al.32250-mg ginger syrup QIDPlain syrup2 weeks<12 weeks4-point nausea scale + frequency of vomiting
Vutyavanich et al.34250-mg ginger capsules QIDPlacebo capsules4 days<17 weeksVAS + Likert scale
Fischer-Rasmussen et al.33250-mg ginger capsules QIDLactose capsules4 days<20 weeksUnique scoring system

  • QID, four times per day; TID, three times per day; VAS, visual analogue scale.