{"componentChunkName":"component---src-components-article-page-article-page-gatsby-container-tsx","path":"/articles/cycle-a-z/do-menstrual-cycles-sync-unlikely-finds-clue-data","result":{"data":{"articleNode":{"id":"35YkjuZLokOoaAMS6IcIo6","title":"Do menstrual cycles sync? Unlikely, finds Clue data","subtitle":null,"seoMetaTitle":"Do menstrual cycles sync? Unlikely, finds Clue data","seoMetaDescription":"There’s a wealth of misinformation, myths, beliefs and social stigmas circling around menstrual health.","openGraphTitle":"Do menstrual cycles sync? Unlikely, finds Clue data","openGraphDescription":"There’s a wealth of misinformation, myths, beliefs and social stigmas circling around menstrual health.","slug":"cycle-a-z/do-menstrual-cycles-sync-unlikely-finds-clue-data","artCredits":"Illustration by Marta Pucci","publishDate":"2017-03-09T00:00+01:00","updatedAt":"2021-01-05T11:39:07.208Z","createdAt":"2017-11-09T11:01:05.613Z","locale":"en","authors":null,"reviewers":null,"editors":null,"featuredImage":{"description":"Women cycle Clue Logo green","file":{"contentType":"image/png","url":"//images.ctfassets.net/juauvlea4rbf/Tv0IR5nNiCs0AagqaSWo6/37b48045a9ee09211cc2221cbc676781/Do-menstrual-cycles-sync__2x.png"},"gatsbyImageData":{"images":{"sources":[{"srcSet":"https://images.ctfassets.net/juauvlea4rbf/Tv0IR5nNiCs0AagqaSWo6/37b48045a9ee09211cc2221cbc676781/Do-menstrual-cycles-sync__2x.png?w=240&h=120&q=50&fm=webp 240w,\nhttps://images.ctfassets.net/juauvlea4rbf/Tv0IR5nNiCs0AagqaSWo6/37b48045a9ee09211cc2221cbc676781/Do-menstrual-cycles-sync__2x.png?w=480&h=240&q=50&fm=webp 480w,\nhttps://images.ctfassets.net/juauvlea4rbf/Tv0IR5nNiCs0AagqaSWo6/37b48045a9ee09211cc2221cbc676781/Do-menstrual-cycles-sync__2x.png?w=960&h=480&q=50&fm=webp 960w,\nhttps://images.ctfassets.net/juauvlea4rbf/Tv0IR5nNiCs0AagqaSWo6/37b48045a9ee09211cc2221cbc676781/Do-menstrual-cycles-sync__2x.png?w=1920&h=960&q=50&fm=webp 1920w","sizes":"(min-width: 960px) 960px, 100vw","type":"image/webp"}]},"layout":"constrained","backgroundColor":"#d8e8d8","width":960,"height":480}},"openGraphImage":{"description":"Women cycle Clue Logo green","file":{"url":"//images.ctfassets.net/juauvlea4rbf/Tv0IR5nNiCs0AagqaSWo6/37b48045a9ee09211cc2221cbc676781/Do-menstrual-cycles-sync__2x.png"}},"sectionDivider":null,"featuredVideoURL":"https://www.youtube.com/embed/qsIA4EiLub4","category":{"id":"6LfXgHxuDZ1T5cXgO7D2Tq","slug":"period","title":"Periods","color":null,"description":{"description":"Articles about Periods"},"parentCategory":{"title":"Menstrual Cycle","slug":"menstrual-cycle"},"locale":"en"},"body":{"body":"Menstrual health has long been overlooked by the scientific research community, and there are many myths, theories, beliefs, and social stigmas which lack conclusive evidence. One of these is the idea of cycles lining up, or \"syncing.\"\n\nOur research partner Dr. Alexandra Alvergne from the University of Oxford [took a look into the origins of cycle\nsyncing, as well as past\nresearch](https://theconversation.com/do-womens-periods-really-synch-when-they-spend-time-together-61890).\n\nTo date, no studies or mathematical analyses have proven the existence of cycle syncing. [The first cycle syncing study](http://www.mum.org/mensyn.PDF),\nconducted in 1971, introduced the idea of the “alpha uterus,” a uterus with a strong hormonal pull that influences the cycles around it to ovulate and menstruate in unison. Other theories include “socially mediated synchrony,” which claims that women's cycles sync to become sexually receptive at the same time, potentially preventing monopolization from a single dominant male.\n\nThanks to our global community tracking every day (we just hit 1 billion data\npoints!), we’re able to test these commonly held beliefs with data, so we\nstarted an investigation to see if cycles really sync.\n\nWe reached out to Clue users and asked if they thought their cycles had been syncing with someone (who also uses Clue).\nWe asked what type of relationship they’re in (friends, siblings, parent/child, partners, roommates or colleagues), if they live together, and if they’re on hormonal birth control.\n\nWe received over **1,500 responses** and narrowed it down to 360 pairs with at\nleast three cycles over a similar time period that we were able to review.\n\nWe analyzed a minimum of three consecutive cycles for each of those pairs and\nfound that 273 pairs actually had a larger difference in cycle start dates at\nthe end of the study than at the beginning of the study. Only 79 of the pairs\nbehaved the opposite way, with the gap between cycle start dates narrowing over\nthe course of the study.\n\n> In other words, according to these results, cycles are actually more likely to\n> diverge (get out of sync) over time.\n\nFor the full sample of 360 pairs, the average difference at the beginning was 10\ndays and 38 days at the end.\n\nWe also noticed that living together did not increase the likelihood of syncing.\n37% (100 out of 273) of the pairs with diverging cycle start dates lived\ntogether, compared to 24% (19 out of 79) for those with converging cycle start\ndates.\n\nFrom our small pilot study of Clue users, our data scientists found that cycles\nbetween pairs and cohabiting individuals did not align. Our statistical evidence\nalso indicated that cycles are actually more likely to diverge, rather than\nsync, over time.\n\n*We’d like to continue to do more analysis on this topic, and others in the\nunder-researched field of female health. If there’s a topic or area of study\nyou’d like us to explore, *[contact us on Twitter\n@clue.](https://twitter.com/clue)\n\n## Details of study\nOf the 1,500 people who agreed to participate in the study, about 50% of the\npairs had to be eliminated because they didn’t both have Clue accounts, which we\nneeded to analyze the data. From there we eliminated any pairs who hadn’t both\nhad cycles in the past year, were on hormonal birth control and didn’t live in\nthe same city, bringing the study down to 500 pairs. We then narrowed the study\ndown further to 360 pairs with at least three cycles — starting after the pairs\nknew one another — over a similar time period. We ran a statistical analysis on\nall 360 pairs to see whether their cycles synced and compared this with a\ncontrol group of completely random pairs who had no relationship to one another.\n273 out of the 360 pairs had a smaller difference in cycle start dates at the\nbeginning of the study than at the end — within this group 100 of the pairs\nlived together. Only 79 of the 273 pairs behaved the opposite way, with the gap\nbetween cycle start dates narrowing over the course of the study — and within\nthis group 19 of the pairs lived together."},"bodyRichText":null,"references":null,"partnerships":null,"relatedArticles":null,"articleFooterDownloadWidgetText":null},"recommendedArticles":{"edges":[{"node":{"id":"3CSH7QXYlyCCmIakmWSweM","title":"How travel and jet lag can affect your period","slug":"cycle-a-z/how-travel-jet-lag-can-affect-your-period","snippet":"Traveling across time zones can throw your hormones — and your menstrual cycle — out-of-whack.","locale":"en","publishDate":"2016-05-12T00:00+01:00","authors":[{"id":"53XXDZWUHSYKw4IQukGcG","name":"Anna Druet, BA","headline":"Science writer","slug":"anna-druet","twitter":null,"locale":"en","profileImage":{"id":"hOkf6TtNjqK8cwKY6uk0O","description":"portrait of anna 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Research suggests that it’s safe to skip them to extend your cycle.","locale":"en","publishDate":"2025-01-21T00:00+01:00","authors":[{"id":"3MIvCjqek8V0jWipRHBRIB","name":"Sarah Toler, DNP, CNM","headline":"Science Writer","slug":"sarah-toler-dnp","twitter":null,"locale":"en","profileImage":{"id":"5aMwJD1FI92OLlydMMjWHg","description":"Science Writer at Clue","file":{"contentType":"image/jpeg","url":"//images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg"},"gatsbyImageData":{"images":{"sources":[{"srcSet":"https://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=225&h=225&q=50&fm=webp 225w,\nhttps://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=450&h=450&q=50&fm=webp 450w,\nhttps://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=900&h=900&q=50&fm=webp 900w","sizes":"(min-width: 900px) 900px, 100vw","type":"image/webp"}],"fallback":{"src":"https://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=900&h=900&fl=progressive&q=50&fm=jpg","srcSet":"https://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=225&h=225&fl=progressive&q=50&fm=jpg 225w,\nhttps://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=450&h=450&fl=progressive&q=50&fm=jpg 450w,\nhttps://images.ctfassets.net/juauvlea4rbf/5aMwJD1FI92OLlydMMjWHg/14c0ab7d316f83800646617b6eb496b4/Sarah_Toler_profile_pic.jpeg?w=900&h=900&fl=progressive&q=50&fm=jpg 900w","sizes":"(min-width: 900px) 900px, 100vw"}},"layout":"constrained","backgroundColor":"#a8a8a8","width":900,"height":900}}}],"featuredImage":{"description":"Illustration of pills and drops of blood, skipping your period on the pill","file":{"url":"//images.ctfassets.net/juauvlea4rbf/4u7vAWNEKwB3i7uyCtG0jp/e14584ae6d212fce504102fe0348a108/Contentful__1_.svg","contentType":"image/svg+xml"},"gatsbyImageData":null},"category":{"title":"Periods","slug":"period","color":null,"locale":"en"}}},{"node":{"id":"1ip2ad6qeU6sW6IauqmWQw","title":"How to deal with your period at night","slug":"culture/how-to-deal-with-your-period-at-night","snippet":"How do you manage your menstruation at night-time? 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