它是上四分位数与下四分位数之间的差异。

It is the difference between the upper and lower quartiles.

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上四分位数是25%的观察值位于其上的值。

The upper quartile is that value above which 25 per cent of the observations lie.

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在范围和目的性以及清晰程度和呈现方式上的得分稍高（前者：平均得分：0.82，四分位差IQR：0.58-0.89；后者：平均得分：0.67，IQR：0.50-0.78）。

Scores were better for the domains of scope and purpose (median: 0.82, interquartile range, IQR: 0.58–0.89) and clarity and presentation (median: 0.67, IQR: 0.50–0.78).

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