Article

Birth rate and its correlation with the lunar cycle and specific atmospheric conditions

Department of Obstetrics and Gynecology, The University of Arizona, Tucson, Arizona, United States
American Journal of Obstetrics and Gynecology (Impact Factor: 4.7). 07/2005; 192(6):1970-3. DOI: 10.1016/j.ajog.2005.02.066
Source: PubMed

ABSTRACT

This study was undertaken to use the Arizona State birth certificate database for Phoenix metropolitan hospitals, in conjunction with National Weather Service records to determine whether there is a relationship between birth rate and meteorologic or lunar conditions. This study attempts to dispel or lend significance to beliefs among hospital staff that the phase of the moon and/or meteorologic conditions are related to birth rate.
Birth records were limited to spontaneous vaginal deliveries, 37 to 40 weeks' gestation, in Phoenix, between 1995 and 2000 (n = 167,956). Daily birth counts were merged with daily surface weather statistics from the National Weather Service for Sky Harbor Airport, and records of lunar phase for the same period.
The analyses revealed no significant correlates of birth rate.
Although there exists a popular belief that the phase of the lunar cycle and weather conditions affect birth rate, no such evidence was found in this study.

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    • "Although the mean pressure fell by 0.9 hPa, it rose again by 0.5 hPa during the last day before parturition (Dvorak, 1978). No association between barometric pressure and onset of parturition was detected in two studies involving human births occurring in two different hospitals (Noller et al., 1996a;Morton-Pradhan et al., 2005), but in another, 19 % more births occurred on days when the barometric pressure was below the average of the preceding 8 years compared with days with average or increased barometric pressure (Akutagawa et al., 2007). In the same study, significantly greater barometric pressure fluctuations occurred on days with 2 or more births than on days with one or no births. "
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    • ", as mentioned in the ' Introduction ' , some researchers have been unable to show any significant difference between moon phases and some physiological and behavioral phenomena in humans ( Peters et al . 2001 ; Waldhoer et al . 2002 ; Alves et al . 2003 ; Holzheimer et al . 2003 ; Wolbank et al . 2003 ; Zargar et al . 2004 ; Arliss et al . 2005 ; Morton et al . 2005 ; Robert et al . 2006 ) . Our experience and ideas arising from different research in the fields demonstrate that this matter may have some methodological causes that respecting them would help the researchers in these fields :"
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