Table 1

The different diagnosis groups and their reasons for inclusion in the study.

ICD- codeDiagnosisReason for inclusion
J06.9Acute upper respiratory tract infection, unspecified (URTI)Similar symptoms with COVID-19
J10Influenza, seasonal influenza virus identifiedSimilar symptoms with COVID-19
N30Acute urinary tract infection (UTI)Reference diagnosis
  • URTI and influenza were chosen because of their similarity with COVID-19 symptoms, where many patients sharing the symptoms were likely to seek medical care. UTI was chosen as a reference group, as the number of patients was estimated to be unaffected by the COVID-19 pandemic.

  • ICD, International Classification of Diseases.