Range

In medicine and statistics, the difference between the lowest and highest numerical values. For example, if five premature infants are born weighing two, three, four, four, and five pounds respectively, the range of their birth weights is two to five pounds.

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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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range 'rānj n, often attrib

1) the region throughout which a kind of organism or ecological community naturally lives or occurs

2) the difference between the least and greatest values of an attribute or of the variable of a frequency distribution

range vi, ranged; rang·ing

1) to change or differ within limits <symptoms \range in severity from mild to severe>

2) of an organism to live or occur in or be native to a region

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(rānj) 1. the difference between the upper and lower limits of a variable or of a series of values. an interval in which values sampled from a population, or the values in the population itself, are known to lie. 2. the geographic region in which a given species is found.