[Observation on effect of five evolutive phases and six climatic factors on pregnancy and sterility]

Objective： To verify statements about the effect of five evolutive phases and six climatic factors in 《huang di nei jing》 on pregnancy and sterility. Methods： Data of missed abortion from Nanjing Maternity and Child Health Care Hospital between 2006-2020 and Yangzhou Maternity and Child Health Care Hospital between 2012-2020 were collected. According to Chinese sexagenary cycle heavenly stems and earthly branches of each year between 2006-2020 was determined. And then based on the heavenly stems and earthly branches, evolutive phases and six climatic factors of each year were established. After that data of missed abortion in each year was compared. According to relative statements in 《huang di nei jing》 , it was observed whether the number of missed abortion cases in someone year increased significantly. Results: Totally there were 28059 cases of missed abortion from the two hospital were collected between 2006-2020 and 2012-2020 respectively. It was found that in the year of Shaoyang phase fire sitian and Jueyin wind wood in the spring (that is the year of 2010 and 2016) the number of missed abortion cases was higher obviously than the other year. When the year of Taiyang cold water in the spring (that is the year of 2009 and 2015), there was a relatively increased number of missed abortion cases. Conclusions: Five evolutive phases and six climatic factors have impacts on human pregnancy and sterility. It was an adverse condition for human reproduction in the year of Shaoyang phase fire sitian and Jueyin wind wood in the spring as well as Taiyang cold water in the spring. Until to now we can still verify statements about the effect of five evolutive phases and six climatic factors on pregnancy and sterility in 《huang di nei jing》.