I don't think it's a direct correlation. But I believe there is a correlation for many of us. I've said it numerous times, stuttering can really do a number on one's self esteem. For those of us that have taken that hit to our self esteem, I believe that is a factor in making friends. Some of us tend to be reserved due to our stutter. We avoid engaging in conversation. We're a bit closed off. That is going to impede connecting with others. So, it's not the stutter itself, so much as the effect the stutter can have on some of us. Not every stutterer has taken this hit to their self esteem. But it was really hard on me.