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I look at the formula for RDI at all oxygen desaturations, which is (60 * ( hrembp + hrop + hnrbp + hnrop + carbp + carop + canbp + canop + oarbp + oarop + oanbp + oanop ) / slpprdp)
It looks like AHI at all oxygen desaturations to me?
If not, what's the difference, and how do I then calculate AHI at all oxygen desaturations?
rdi0p (with that formula) represents the AHI included events at all oxygen desaturations. From what I understand, at the time these data were originally scored/created (late 1990s), the AHI/RDI terms were essentially interchangeable and did not (yet) include the RERA distinction. "rdi*" variables have carried through into many of our other datasets, though these more closely match an AHI because we don't typically score RERAs.