Took the exam yesterday, I had about 1 to 3 stats questions per block.
I only used UWorld and Step 2 Secrets to review stats but I made sure to understand all the important concepts. Might be worth having a quick review of FA Step 1 if you're really weak.
It all depends on how your comfort level with the subject. As I was going through UW, I felt like I was able to recall a lot of the biostat I learned for step 1. If you are strong in stats I think you could get away with UW only. That said, I think it would be beneficial for you to run over the 8-9 pages in the old FA Step 1 just to relearn your definitions and formulas.