I'm Curious

So I play a school sport and we have to fill out a big packet of health stuff like if we have asthma and stuff like that. One of the questions was if I have got my period and how many I have had this year. I wasn't offended by this question or anything, and I answered it correctly, but I was just wondering why they need to know that. I'm a very curious person, I know😂😂. If you have an answer or idea please write it in the comments. 😁