Four categories, in that case: #4. Breeding, not brumated.

The average lifespan is not relevant. If there's a difference, it would show up in the mortality rate (and potentially in clutch sizes and mortality rates among the offspring).

Now we just need a few hundred snakes of the same species and locality and offer them identical housing and identical care (apart from the brumation). I may have overlooked something else, but that's not really relevant at this point. These types of studies don't get done because the results aren't interesting to anyone except those who keep these snakes as pets.