From July 2019 to January 2020, 70 women with AMA who had chosen selective caesarean section in the Third Affiliated Hospital of Nanchang University and 65 non-pregnant women who had undergone selective surgery in our hospital were both included in the study (The inclusion and exclusion criteria are detailed in the supplementary materials). ...it can be concluded that CSA cannot be predicted by a single variable nor can the size of CSA be judged by a single index, such as the length of gestation week or fasting time. ...this study is a single center study, the number of cases included is limited, and multi center, large sample data are needed to verify this result. ...future research should indicate whether the new fasting guidelines are also applicable to women with AMA.Funding No external funding.Declaration of Competing Interest The authors have no interests to disclose with the matter.Appendix A Supplementary data Supplementary dataImage 1Appendix A Supplementary data Supplementary data to this article can be found online at https://doi.org/10.1016/j.jclinane.2021.110270.