Our analysis is, at least to our knowledge, the one with the largest data set (in terms of completed lunar cycles) to date for the problem under investigation. Using methods of spectral analysis we found overwhelming evidence for the hypothesis that there is no association of the lunar cycle and the number of births.
So write Oliver Kuss and Anja Kuehn in a study called “Lunar Cycle and the Number of Births: A Spectral Analysis of 4.071.669 Births from South-Western Germany.” The doctors are both at the University of Halle-Wittenberg. Their paper has been submitted for publication. The preliminary version can be read at Dr. Kuss’s web site.
(Thanks to investigator Kai Jung for bringing this to our attention.)