There are many, many things that rich people buy in larger quantities. It turns out medications for certain serious diseases may be one of them.

A new analysis has found that, for some types of medications, income is a pretty strong predictor of how often someone is picking up a drug to treat an ailment.

The analysis, by GoodRx, a company that tracks prescription drug prices, looked at how often residents of different neighborhoods filled prescriptions for different categories of drugs.