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Issue link: https://digital.macdirectory.com/i/1496181
slightly longer menstrual cycles for cycles in which they received a COVID-19 vaccine, but participants’ cycles typically returned to prevaccination lengths the cycle after getting a vaccine. The Apple Women’s Health Study invites anyone who has ever menstruated across the US to contribute to scientific research by enrolling via the Apple Research app. The study enables participants to share their cycle tracking data, along with other health data from iPhone, and Apple Watch if they have one. Participants can also provide a more well-rounded set of information about their personal and family history and lifestyle through occasional surveys. The Research app helps the study reach individuals across various stages of their life, varying races, and across the US. Participants control the data types shared with the study, with transparency into how the data will be used for the purposes of the study. Cycle Tracking on iPhone and Apple Watch Cycle Tracking is available in the Health app on iPhone or the Cycle Tracking app on Apple Watch, allowing users to track their menstrual cycle along with details like symptoms or ovulation test results. Cycle Tracking uses information users have logged for previous periods and cycle length, plus heart rate data from Apple Watch, to offer period and fertile window predictions. Users can turn on notifications to tell them when their next period or fertile window is approaching.