is for overnight hospital stays: Zero. I guess that's not quite true--I'm sure I was in the hospital a few days when I was born. Back then they didn't rush people out of the hospital as fast as possible, the way they do today. And I was quite small--a couple ounces lighter and they'd have put me in an incubator.
But I've been very lucky health-wise. Another zero: number of stitches I've had in my body.
10 hours ago