Table 2

Handling of missing data

Total cases585 396Separated as below
Duplicate episodes32 829Excluded
First year attendances182 184Not part of main analysis
Children or unknown age25 954Not part of main analysis
Missing sex1038Imputed by inferring sex from name
Missing triage category74 977Imputed by logical rules
Missing NEWS in triage category 16975Imputed by sampling matched cases
Died560Counted as admissions
Unknown outcome1616Excluded (missing completely at random)
Irregular discharge14 151Excluded
Transfers5816Removed to avoid double counts
  • GP, general practitioner; NEWS, National Early Warning Score.