Something recently reminded me of a military training class I was in many years ago – taught in the Army – concerning field first aid. Like most, it was pretty much your standard, boring Army class. But it did have one moment that made it an absolute gem.
The instructor was going over how to estimate how much of a burn casualty’s skin had been affected. He taught us the “rule of nines” for doing that.
For those who might not be familiar with it, the “rule of nines” works as follows. Different parts of the body are each assigned a fixed number of “nines”. Each arm is assigned one “nine”; each leg, two “nines”. The front of the torso is similarly assigned two “nines”; ditto the back and buttocks. Finally, the head and neck is assigned one “nine”.
A “nine” is short for “9 percent” – as in 9% of a person’s total skin area. So each arm is 9% of the average person’s skin; the head and neck, also 9%. A leg, front of torso, or back and buttocks each have 2 nines – so they’re each 18% of the average individual’s total skin area.
It’s a quick and dirty rule, and isn’t always perfectly accurate. But it’s apparently generally fairly close. And when you’ve got to estimate quickly how much of an individual is burned, it’s certainly better than making a wild-ass guess.
Well, there’s one in every crowd – and the instructor had been through this a few times before. So before anyone could do the math and ask, he then said the following.
“Now, I know some of you have probably totaled that up, and came up with 99%. That’s correct. There’s 1% left over.”
What followed was IMO one of the true “money lines” of all time. The instructor then smiled slightly, and said, matter-of-factly and with a straight face:
“Now, I don’t care if you’re John Homes – 1% is enough.”
Thirty-plus years later, I couldn’t tell you a damn thing about the rest of that class. But I can sure as hell still remember the “rule of nines”.
Thank God I’ve never had to use it.