Seasonal variations of menstrual cycle length in a large, US-based, digital cohort

Affiliations

• ¹ Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, 02115, MA, USA.
• ² Health, Apple Inc., Cupertino, 95014, CA, USA.
• ³ Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, 02115, MA, USA.
• ⁴ Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, 02115, MA, USA.
• ⁵ Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, 02115, MA, USA; Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, 02115, MA, USA.
• ⁶ Epidemiology Branch, Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, Durham, 27709, NC, USA.
• ⁷ Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, 02115, MA, USA. Electronic address: shruthi@hsph.harvard.edu.