Effects of Ginger and Expectations on Symptoms of Nausea in a Balanced Placebo Design (original) (raw)
Figure 2
Number of head movements in male and female participants (HM; means +/− SD).
Male (Panel A) and female (Panel B) participants received either ginger or placebo in a double-blinded design and (immediately prior to rotation) were informed to have received ginger or placebo in a balanced placebo-design, i.e. half of the participants of each group were correctly informed while the other half received false information. When the four groups were compared by effects of drug and information on symptom rating (SR), rotation tolerance (RT), and head movements (HM), MANOVA results were only significant when sex of participants and the experimenters were added as between factors to the analysis (F = 4.307, p = .009).