Interesting facts about stuttering

Stuttering is universal
Stuttering is often genetic (65% of People Who Stutter often have a family member who stutters).
Stuttering affects four times as many males as females
People Who Stutter (PWS) are normally fluent when speaking in unison, whispering or singing
PWS usually stutter less when they are relaxed and rested verses being excited and fatigued
1% of the population stutters but 5% of people stutter at some time and recover spontaneously during childhood
No two individuals who stutter, stutter in the same way
There is evidence of stuttering from the Biblical times of Moses, however a definitive known cause for stuttering is yet to be discovered

Suggestions

When speaking to PWS (People Who Stutter)

The PWS should be listened to patiently, not be hurried and not interrupted
NEVER finish a PWS word unless asked to by the PWS
Don’t fill in words or supply answers
Don’t look pained, pitying or impatient
Do not withdraw eye contact, glance nervously at the PWS or stare vacantly into space
Speak naturally
Maintain an unhurried, calm and interested manner