Does convalescence stack with defiance?

[TheodoreMcIntyre]

Is there any proof that the math is correct? Is it 44%, or would it be .2 x 1.2 = .24 (24%)?

I know in Borderlands 2 that Flicker works multiplicative. It makes 20% Burn chance only 26% when you have a bonus of 30% from Flicker.

I am fairly certain there are several threads about parsing that sort of information but I don't know if I'm allowed to link those, so