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@EdwardZ
You should, I suggest, provide a model for measuring frame size. There are a number of measures in use.
and, for sloping top-tube frames, the measures with a virtual horizontal top tube. A number of vendors don't even bother but instead list their framesizes like T-Shirts as S,M,L with the determinant factor being the effective reach.
Two identifical frames from the same OEM can have under different brands quite different listed frame sizes.
Given the average height in the UK is 5'9 1/2" (and just over 5'10" in the US) I would expect average frame size of 54 cm c-c for advanced recreational road cyclists in the UK. While cyclists are not uniformly distributed among the population I would still expect 53-55cm to be a good average in the US and UK given the dominant fitting models.