49d85a5b_North_Carolina_Crash_Data__Response
[Suggestion] I sometimes need three variables to cross reference. Like, age/seating position/injury status. As well as inputing age instead of groupings and race. Thank you [Response] 
The use of filter variables provides a roundabout way of incorporating a third variable into the mix. Suggest you contact us (see About the Data) for more specific information.
North Carolina Crash Data
Response