Table 1

Size of cohorts and defining ICD-10 codes

GroupsNICD-10 codes
Bronchiolitis (60% male)RSV4399J12.1, J21.0
Non-RSV243J12.0, J12.2, J12.3, J12.8,
J21.1, J21.8
Unspecified13‚ÄČ304J12.9, J21.9
UTI (control) (52% male)3326N39.0
OutcomesWheezing4472J45.*, J46*, R06.2
Head injury325S09*
ExcludedNeonatal admissions4654NA
Both diagnoses191NA
  • ICD-10, International Classification of Diseases, 10th revision; RSV, respiratory syncytial virus; NA, not applicable; UTI, urinary tract infection.