Methods: Women with nausea and vomiting of pregnancy,
who first attended an antenatal clinic at or before 17 weeks’
gestation, were invited to participate in the study. During a
5-month period, 70 eligible women gave consent and were
randomized in a double-masked design to receive either oral
ginger 1 g per day or an identical placebo for 4 days. Subjects
graded the severity of their nausea using visual analog scales
and recorded the number of vomiting episodes in the
previous 24 hours before treatment, and again during 4
consecutive days while taking treatment. At a follow-up
visit 7 days later, five-item Likert scales were used to assess
the severity of their symptoms.