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A statistical measure of the dispersion or variation of values determined by the endpoint values themselves or the difference between them; e.g., in a group of children aged 6, 8, 9, 10, 13, and 16, the r. would be from 6 to 16 or, alternately, 10 (16 minus 6). [O.Fr. rang, line fr. Germanic]
therapeutic r. refers to either the dosage r. or blood plasma or serum concentration usually expected to achieve desired therapeutic effects. Some patients will require doses (or concentrations) above or below this r. Some patients will experience drug toxicity within this r.
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