How to mask data values?

Summary

In OTBI, how to display an * instead of a number or percentage where the results might identify people

Content

In OTBI I would like to mask identifiable data such as a count or a percentage where the result would identify people, for example, when a count might be 5 or less.  For a headcount analysis by department and age, if a a value was < 5 an * should appear rather than a number.

Using formatting I could replace the number with anything.  This works OK if the OTBI analysis is curated and published but how could I prevent that number from being visible for self-service.  Is it possible?