1%. Men are affected approx 4:1 compared to women. We often ask the question, "Where are all the stammerers?". Seems many either don't feel the need to seek help or community, don't want to, or don't know about it. If you live in the UK, you can reach out to the British Stammering Association or Stamma. In fact, StammaFest is next week in Liverpool if you'd like to go and meet other people who stutter and hear some great workshops. It's an international conference for people who stammer.