Sample size calculation gave 45 women in each group, based on alfa 0.05 and beta 20 under condition of a 30 % effect of moxibustion vs. 20 % of spontaneous version in the control group in primiparae and 60 % in multiparae, respectively. Thus, 4 times 45 women in each group were sought. Only women who had performed three treatments were judged under the principle of intention to treat.