Participants contribute meaningful data during first two years of study

Infographic showing the number of surveys completed, reports of menstrual symptoms, and menstrual cycles tracked during the study's first two years.
During the first two years of the Apple Women’s Health Study, from November 2019 –October 2021, more than 70,000 participants contributed data. Participants completed more than 450,000 surveys and logged more than 720,000 menstrual cycles. There were more than 2.4 million reports of at least one of 22 menstrual symptoms.

November 2021: Thanks to survey, menstrual cycle tracking, and sensor data shared by Apple Women’s Health Study participants throughout the study’s first two years, the study team has been able to gain a deeper understanding of women’s health across the lifespan.

Launched on November 14, 2019, the study is a collaboration between the Harvard T.H. Chan School of Public Health, Apple, and the National Institute of Environmental Health Sciences (NIEHS), part of the National Institutes of Health (NIH).

Multidimensional data provides insight into women’s health

The study aims to advance the understanding of how demographic and lifestyle factors could impact menstrual cycles and gynecologic conditions. More than 70,000 participants have contributed data to the study through October 2021. Since study launch, there have been:


surveys completed

2.4 million

reports of menstrual symptoms

*reports of at least one of 22 menstrual symptoms


menstrual cycles logged

In addition to survey and menstrual cycle data, participants provide information on lifestyle factors, such as stress, sleep, and nutrition. Multidimensional data will be analyzed to understand population-level trends in menstrual and reproductive health outcomes, as well as how these lifestyle and other environmental factors impact those outcomes.

These insights and data are opening doors to help the medical field learn new things in women’s health. Having data across a larger and more diverse population helps doctors understand the full scope of menstrual and reproductive health, will enhance care delivery, and improve the ability to diagnose and treat gynecologic disease.

Foundational datasets collected through the Apple Women’s Health Study will ultimately help equip physicians with the information to better take care of their patients, and for women to better take care of themselves.

Thank you to participants for advancing scientific discovery

The Apple Women’s Health Study would like to thank its participants for their continued participation and contribution to advancing women’s health research. The study is enrolling participants. Join now by downloading the Research app.

Meet the team

The principal investigators of the Apple Women's Health Study have unparalleled expertise in reproductive epidemiology and women’s health.

Research effort you can join

Your participation in the Apple Women’s Health Study will enable innovative research that would have been impossible before now.

Data collection

Participants control what data they share and can stop sharing data with the study at any time.
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