Hoffmann F, Kawiani D
Geburtshilfe Frauenheilkd. 1976 Sep;36(9):780-5.
The monthly variations and the mean daily conception rates of 136,828 deliveries from 1803 to 1970 within the same population area are reviewed. It was found that the conception rate during the first half of the 19th century showed a rapid increase from its low during the winter to its maximum in May and that this pattern became much less pronounced in the 20th century. During the second half of the 20th century, the highest conception rate shifted for the first time to the summer and the third quarter of the year. In contradistinction to this development, the low of the conception rate during the winter from January to March is much less pronounced during the first half of the 20th Century and remains constant with the lowest conception rate in February into the second half of the 20th century. The importance of the influence of nature during the spring and winter and of the working and living patterns as well as the influence of family planning and recreational activities on the intensity of procreation in the human within the last 200 years is discussed.
回顾了1803年至1970年同一人口区域内136,828例分娩的月度变化和平均每日受孕率。研究发现，19世纪上半叶的受孕率从冬季的低点迅速上升至5月的最高点，而这种模式在20世纪变得不那么明显。在20世纪下半叶，最高受孕率首次转移到夏季和一年中的第三季度。与这种发展形成对比的是，20世纪上半叶1月至3月冬季受孕率的低点不那么明显，并且在20世纪下半叶2月受孕率最低的情况下保持不变。讨论了过去200年中春季和冬季自然因素的影响、工作和生活模式以及计划生育和娱乐活动对人类生育强度的影响。
