Hi Velinda,
Here are some information might be useful for you:
A transaction risk index is calculated for 3 health factors. You can get it with the REST API. You should not try to access the central tables, because they change in the future.
Some URIs which might help you in this case :
https://doc.castsoftware.com/display/DASHBOARDS/REST+API+Reference+Documentation+-+1.14.x