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I can't find the post from earlier today about how the percentages are arrived at, but have just been assured by my practice nurse that in my case 70% result means 70% of average lung function for my gender, race, height and weight - nothing to do with smoking history as stated by a UK contributor - maybe hypercat? not sure ....
She did say it would be possible but not very accurate for very sophisticated sprirometry equipment to evaluate such information as length of time smoking, amount smoked and so on, but this probably wouldn't be totally accurate.
I'm very relieved, because if my 40 odd years of smoking had been taken into account, my 70% (stable since diagnosed 3 years ago) would've been 70% of hardly anything!
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