Analysis population and missing data
The data for the analyses come from different sources. The data of the control group and the data of the insured persons of the participating health insurers are assumed to be complete. Data from the ASHIP are available for all patients. Therefore, it can be assumed that the outpatient care data of all patients are complete. Inpatient data of patients who are not insured by the participating health insurance company will be requested from the APN and entered into a database. Subgroup analyses were performed to assess the data quality of these data. Data can be supplemented by means of imputation procedures.