I think that the 1% includes a lot of covert stutterers and people who aren't comfortable talking a lot. Over the years I have ran into a guy who only started telling me about his stutter after he learned I was studying to be an SLP, and I've met multiple people who I perceived stuttering-like dysfluencies in their speech but they didn't seem comfortable talking about it so I'm not really sure 🤷‍♀️ I also later found out that a good friend from high school's brother had a stutter, but I literally never knew just because he didn't talk very much. Thinking back, he was much more responsive over texts so that maybe should have been a clue, but I didn't put it together. Oh, also I recently ordered some food at a fast food type place while wearing a stuttering hat. The lady at the register didn't mention it at all. But she kept looking at it, and before I left she looked me in the eyes and very earnestly was like "you have a great day" and like, gestured to her own hat (which was just plain black)? So I have no idea what that means but stuttering was probably meaningful to her in some way. I think that a lot of people who stutter are just really good at blending in so you don't always realize.