any study out there on the typical cadence for beginners

Hi can anyone help me out by providing any reference or website citing a large scale study of the typical preferred cadence of normal everyday (untrained) cyclists? I am working on a project that needs this info. Sadly personal observations are of little value without some kind of citation. thanks
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2. Google it like anyone else can.
That's not really from a study though, just my casual observances over the years.
PP