QB injuries don’t hit as often as they do at other positions. But that can make them all the more devastating.

What goes into predicting a QB injury? There are two key factors:

• A player’s injury history
• The way he plays

If you run the ball a lot, then you simply face more risk. More hits = more opportunities to get injured.

But there’s also that list of past injuries. Tua Tagovailoa’s concussion history means he’s more likely to sit out longer if he suffers another. And that guy with the soft-tissue issues in his recent past? You should know he carries extra risk.

Use these calculations not only to gauge who’s most likely to get hurt, but also which backup QBs might have a better shot at finding opportunity.