Letters
Birth month and cardiovascular mortality
Studying birth month and mortality: what about the perinatal photoperiod?
BMJ 2020; 368 doi: https://doi.org/10.1136/bmj.m863 (Published 06 March 2020) Cite this as: BMJ 2020;368:m863
- Thomas C Erren, director and chair,
- Judith Mohren, research associate,
- Philip Lewis, research associate
- Institute and Policlinic for Occupational Medicine, Environmental Medicine and Prevention Research, University of Cologne, 50937 Cologne, Germany
- tim.erren{at}uni-koeln.de
Zhang and colleagues found associations between birth month and season and cardiovascular disease mortality.1 They suggest further research to confirm their observations and find possible mechanisms. Rather than focusing on birth month and season, perhaps …
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