Do menstrual cycles sync? Unlikely, finds Clue data

I have shared with 17 people on Clue (friends and my sister) just because I think it’s interesting? Based on this, people do not seem to sync. Like, there are definitely patches where more people have their period than other times, but it’s different groups of people and the start dates only loosely line up. Sometimes I look extra closely at people I know are close to each other, and they’re often not synced, and the average cycle for each person is different so even if they start on the same day once, it doesn’t last to the next cycle or two

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