My best advice to you is to not worry about the essay topic. There is no way to predict what will be asked. However, I will tell you (i took the pcat for the first time last October) the essay is not that big of a challenge. The challenge is being able to put a cohesive essay together after going through 5 tedious test sections. The essay did not require any specific statistics or information. It's really about the ability to express an opinion in a clear, articulate manner. I received a 4, and my essay did not utilize any specific information, and it wasn't very long. Don't worry, you will do great. 🙂