Factors insurers might use can include:
a). Age;
b). Marital status;
c). Gender;
d). Occupation;
e). Credit score;
f). Driving history (including convictions)
g). The main location the car can be used.
You could also adjust other things, like excess (deductible). You get lower insurance premiums when an excess goes up because when this happens, you promise the insurer that you take more of the costs if you make a claim.