A Bathroom Reader

Whenever I go into a public restroom, I remember this fact I read. It said that contrary to what many believe, the least used stall is the one closest to the entrance. So, naturally I started going into the very first stall in public restrooms, but then I thought, how did they even measure that? Did they record who went into which stall in several major cities? And if I read that statistic in a very well known book, sold in stores nationwide, how many other people are now using the first stall more than they would have before?