Texts
The texts for Group 1 and Group 2 were created in Japanese by using materials developed in English [Before translation, the authors checked the relevance of the content of the texts. First, the authors assessed if the textual information was consistent with existing evidence in 2016. Systematic reviews and a policy statement published after the development of the original English version were examined [The control group (i.e., Group 3) received a brochure on healthy pregnancy and delivery developed by the Ministry of Health, Labour and Welfare [