The developers of UXO have released information on character statistics and also have organized their FAQ so it's a bit more easy to find the topic you're looking for.

   The character statistics section offers a detailed description of the various attributes for each character. Statistics are organized in the following way:

•  Base Statistics (Strength, Dexterity, Intelligence, and Constitution)
•  Derived Statistics (Base Damage, Offense, Defense, Hit Points, Power, Critical Hit Chance)
•  Secondary Statistics (Hit Point Regeneration Rate, Power Regeneration Rate, Base Attack Speed, Movement Speed, Resistance, Luck)

   You can a detailed description about each of these statistics from the following article: http://www.uxo.ea.com/feature_stats.html