My question would be: Where in Illinois did the study take place? 100 wallets isn't very many for a comprehensive result. According to the U.S. Census Bureau, there are 12.8 million people living in Illinois. Was the study done in Chicago, some small 'burb, or a farming town, or some combination of them? Doing the study in Chi-town might produces some signficantly different results than somewhere further south in the state.