### Median

Represents the middle value in a series of values; half of the values are above it, and the other half are below it.

### Risk Reduction

A statistical expression that appears most commonly in reports about health risks and interventions for limiting them.

### Relative Risk Reduction

A risk reduction statistic that only looks at a portion of the statistic cited. This is most often very misleading.

### Absolute Risk Reduction

A risk reduction statistic that looks at the whole of the statistic cited. This is the most accurate way to cite a risk reduction statistic.

### Random Data

Data that is representative of the whole population. It suggest that no selection bias distorted the sample data.

### Sample Size

This should be large enough to accurately represent, generalize, or project the whole population. The higher degree of variability, the higher this must be. Usually the higher this is, the more reliable the findings.

### Absolute Number

The total or aggregate of something, expressed as a number without relationship to other numbers.