The effect of the lunar cycle on frequency of births and birth complications

Am J Obstet Gynecol. 2005 May;192(5):1462-4. doi: 10.1016/j.ajog.2004.12.034.


Objective: The purpose of this study was to examine the influence of the lunar cycle on the frequency of deliveries and/or delivery complications.

Study design: This was a retrospective cohort, secondary analysis of 564,039 births across 62 lunar cycles that were identified from North Carolina birth certificate data from 1997 to 2001.

Results: Using analysis of variance and t-tests, we found no significant differences in the frequency of births, route of delivery, births to multigravid women, or birth complications across the 8 phases of the moon or between documented high- and low-volume intervals of the lunar cycle.

Conclusion: An analysis of 5 years of data demonstrated no predictable influence of the lunar cycle on deliveries or complications. As expected, this pervasive myth is not evidence based.

MeSH terms

  • Analysis of Variance
  • Birth Rate*
  • Cohort Studies
  • Female
  • Humans
  • Incidence
  • Infant, Newborn
  • Infant, Premature
  • Moon*
  • North Carolina / epidemiology
  • Obstetric Labor Complications / epidemiology*
  • Pregnancy
  • Pregnancy, Multiple
  • Retrospective Studies
  • Risk Factors