Interval level measures are characterized by:

Interval level measures are characterized by the absence of a true zero point. This means that in interval scales, zero does not indicate the absence of the measurement being assessed; rather, it is just another point on the scale. For example, in temperature measured in Celsius or Fahrenheit, zero does not mean "no temperature" but rather a specific degree of temperature. Consequently, the differences between values at this level are meaningful and can be quantified, allowing for the calculation of averages.

On the other hand, the meaningful hierarchical structure, referred to in another choice, pertains more to ordinal scales, where numbers indicate a ranking without ensuring equal intervals between them. The presence of absolute zero is characteristic of ratio level measures, where zero truly indicates a complete lack of the variable being measured, as seen in measurements like weight or height. Only qualitative attributes suggest a nominal level, which does not allow for the rigorous numerical relationships found in interval measures. Thus, the defining feature of interval scales is their lack of a true zero point, differentiating them from other measurement levels.