Applied a difference-in-differences design comparing patients switching across payment schemes (fee-for-service/capitation vs. salary) against same-scheme switchers.
Patients switching from a salaried GP to a fee-for-service GP experienced a monthly increase of 85 defined daily doses (DDD) of antibiotics per 1,000 patients (SD = 20) compared with salaried-to-salaried switchers.
Patients switching from a fee-for-service GP to a salaried GP had a monthly reduction of 21 DDD of antibiotics per 1,000 patients (SD = 7) compared with fee-for-service-to-fee-for-service switchers.