Telling stats comparing suburban density in US vs the rest of the world

This page of stats speaks volumes about the huge difference in density between US suburbs vs. the rest of the world.

Suburban, Core & Urban Densities by Area: Western Europe, Japan, United States, Canada, Australia & New Zealand
http://www.demographia.com/db-intlsub.htm

Of note:
-US suburbs are less than half the density of Japanese suburbs and less than one third the density of UK suburbs.
-US is the world leader in low suburban density.
-US urban areas are just over 25% as dense as Japanese urban areas and less than 1/3 the density of UK suburbs.

On a 2014 trip to Japan, I noticed that many of the suburbs of Tokyo feel much denser than the downtown areas of many US cities.