How many people with a stutter also have OCD?

How many people with a stutter also have OCD? Lately I've been noticing (especially on this subreddit) that a lot of people with a stutter also have OCD, and I'm one of them. I have OCD since I was a little kid, and I've a stutter since something like 4 years ago. My OCD has also been getting worse and worse lately.