How to create a special KPI in IT Analytic for SEP

Hi,

Started to use IT Analytic for SEP which is working fine.

Have got specail request on a KPI that I dont know how to build and looking for some help this way.

The KPI shall be like this.

Percent of SEP clients that have newer defenition files then 3 days. The goal is 95 %.

I have tried to configure this by myself but im lost in this MDX querys.
I have been looking on this page http://www.symantec.com/connect/articles/configure-key-performance-indicator-it-analytics-symantec-endpoint-protection-content-pack which is good but im lost in the MDX.

Thanks for all help I can get // LGL