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quartile

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quartile
[kwôr′təl, kwôr′tīl]
Etymology: L, quartus, fourth
one-fourth of the distribution of scores. The first quartile would be the lowest 25% of scores, the second quartile would represent the 26% to 50% range of scores, and so on.

quartile [kwor´tīl]
any of the three values that divide the range of a probability distribution into four parts of equal probability; the first, second, and third quartiles are the 25th, 50th, and 75th percentiles.

quartile
one of the values establishing the division of a series of variables into fourths, or the range of items included in such a segment.


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After accounting for other factors that might be related to preeclampsia and exposure, the authors estimated that pregnant women in the highest quartile of [PM.
Each characteristic was scored in quartiles, with quartile 1 being the lowest complexity.
When subjects in the second through fourth quartiles of serum insulin concentration were compared with those in the first or lowest quartile, higher insulin levels within the normal range were associated with statistically significantly increased risk of prostate cancer.
 
 
 
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