The sample hospital lies in a relatively under-developed province in China as a secondary public hospital, and around 160 thousand inpatients are admitted to it annually. Inpatient records from internal medicine and pediatric departments whose diagnosis contained pneumonia were extracted from the Hospital Information System from January 1st, 2015 to December 31st, 2016. Collected information comprised patients’ ID, admission number, department, diagnosis, therapeutic effects, rescue effects, name of doctor, total expenditure, specification, unit price and the quantity of drugs prescribed. The policy came into effect on January 1st, 2015, so we divided patients into before-intervention group and after-intervention group according to the day they discharged.
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