37 Surveillance of Severe Acute Respiratory Infections 2 Supplementary information Results Flowchart Data validation For each of the three indicator variables (PCR, Contact and droplet precautions and ICD-10 diagnostic codes) we selected two random weeks to compare our results to regular quality control data in our hospital. For all three surveillance indicators, we found the same patients in both our dataset and the quality control dataset. Overlap between the different surveillance indicators The overlap between the registration of contact and droplet precautions with the other two outcome measures has increased in the third timeperiod compared to the first and second timeperiod. 417,119 Hospitalisations 117,404 Hospitalisations included Exclusion: Admissions with a duration of less than 24 hours and not transferred to another hospital: 221,174 Re-admissions within 10 days: 78,541 RT-PCR tests: 11,959 Registration of contact and droplet precautions: 4,683 ICD-10 diagnostic codes registered: 3,908 Supplementary Figure 1: Flowchart of patient inclusion
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