In November 2022, Aella posted this Twitter poll:

19% of women without pre-menstrual symptoms believed in the supernatural, compared to 39% of women with PMS. I can't do chi-squared tests in my head, but with 1,074 votes this looks significant. Weird!

Here's another one

Now 72% of people with PMS self-describe as neurotic, compared to only 45% without. Aella writes more about this here, and sebjenseb confirms here. I'm less weirded out by this one, because you can imagine that people feel neurotic because of PMS symptoms, but it's still a surprisingly strong effect.

https://www.astralcodexten.com/p/survey-results-pms-symptoms