ARR, RRR, NNT & NNH

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THE most testable calculation. ARR = CER − EER. RRR = ARR/CER. NNT = 1/ARR (round UP). NNH = 1/ARI. Relative vs absolute risk spin (RRR looks big, ARR small). Fully worked example with arithmetic. NNTCalculator. Exam tip: beware papers quoting only RRR; always look for ARR/NNT. Lower NNT = more effective.

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