Ghiandoni G, Seclì R, Rocchi M B, Ugolini G, Cancelli V
Institute of Biomathematics, Urbino University, Urbino, Italy.
Gynecol Obstet Invest. 1998 Aug;46(2):88-90. doi: 10.1159/000010008.
To study time distribution of spontaneous deliveries.
A retrospective analysis of 1,791 spontaneous deliveries over a 4-year period (1993-1996) was made at the department of Obstetrics and Gynaecology, Civil Hospital, Fano, Italy. Circular statistics techniques (maximization of mean vector length) were used.
Some unexpected infradian disuniformities (with 60- and 90-hour periods) were observed. Moreover, a correlation between the distribution of spontaneous deliveries and the lunar phases was found.
In this study, some unexpected infradian disuniformities were found. However, no biological explanations appear to be reasonable in light of current knowledge, so the interpretation of these results remains an open question.
研究自然分娩的时间分布。
对意大利法诺市民医院妇产科1993年至1996年这4年间的1791例自然分娩进行回顾性分析。采用了圆形统计技术（平均向量长度最大化）。
观察到一些意外的超日节律不均匀性（周期为60小时和90小时）。此外，还发现自然分娩分布与月相之间存在相关性。
在本研究中，发现了一些意外的超日节律不均匀性。然而，根据目前的知识，似乎没有合理的生物学解释，因此这些结果的解释仍然是一个悬而未决的问题。
