"Pixel Density" on DPReview

Some time ago, probably a year (or maybe two) ago, DPReview used to include the "pixel density" in the stats page for every camera. I believe it was pixels per square centimeter, or some such. But since then, it appears they no longer include this measurement. What happened to it?? I really miss this because it was very helpful as a basic indicator of image quality. If a manufacturer puts 16 MP on a microscopically sized point-n-shoot sensor, you know the IQ is going to be pretty bad compared to 16MP on a full frame. Am I missing something, or why do they no longer include it?
TIA!