What is “Ratio” on the Thread widget?

Each thread shows a Thread widget. In it is a Ratio field. What is this ratio measuring?

1 comments

Boosts, from what I can tell looking at other threads. The ratio is always equal to the boosts.

I assume it's supposed to be the thread's score, which I believe currently only looks at boosts (I know the personal reputation formula got changed, but sorting by top still goes by boosts only).