I asked about the statistics of stuttering severity. The answer by Woody Starkweather (Temple University) is that, as for "neary all" disorder severities the distribution is right-skewed with many mild stutteres and few severe ones.
A single number index of stuttering severity has been developed. It's called PDST (Percent Disfluent Speech Time) and it includes "possibly most" elements of stuttering severity. It is computed by dividing the sum of the times of stuttering behavior durations by the total duration of speech time.
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