Different factors go into the final settlement of a personal injury claim. Economic damages are easier to calculate since they have a definitive value. Medical bills and lost wages already give people an idea of how much they can recover. You can estimate compensation for ongoing and future treatment and lost income as well.
Non-economic damages tend to make the calculation of reimbursement difficult. Unlike a hospital bill, damages like mental anguish are intangible. The law does not have any guidelines on measuring the cost of pain and suffering. If the case goes to trial then usually, the jury decides how much money a victim gets for non-economic damages.