I've met a decent amount of them actually. 1 percent may be a tad high but if you listen to people talk closely you can tell they have a stutter even if they don't outright stutter. For example, pretending they don't remember a word or using weird substitution tactics. This is something that only we or a speech therapist would notice.. You're looking for people that overtly stutter which is definitely way less than 1 percent.