Table 1

List of selected variables

Individual patient informationType
Patient demographicsYear of birth (age)Continuous
Sex (male, female)Categorical
HospitalisationAdmission dateContinuous
Discharge dateContinuous
Movement within the hospitalCategorical
DiagnosesPrimary, associated and related diagnoses coded using ICD-10: 1846 unique diagnoses grouped in principal and secondary diagnosis (first three characters)Categorical
Laboratory valuesTest ordered (yes, no)Categorical
Sampling dateContinuous
Test resultContinuous
MedicationPrescriptionsContinuous
Administered drugsContinuous
Procedure codesClassification of medical acts: 1679 unique codes (first four characters)Categorical
ATC code87 unique ATC codes (first three characters)Categorical
OBS_NORM (laboratory values)1724 unique laboratory tests: ranked as high, normal, low, tested, not testedCategorical
Population based information by geocoding code
Social determinants of healthAgeContinuous
Family composition
Employment status
Living conditions
Administrative data
Postal Coderural, semi-rural, urban, extraterritorial, noneCategorical
Entry modeEg, transfer from another establishment, after consultation with a hospital specialist, referred by an external doctor, work accident, …Categorical
Entry typeUrgent, with confirmed appointment, spontaneousCategorical
Exit modeEg, transfer to another establishment, death, return homeCategorical
Hospital clinical unit (ward) code186 unique categoriesCategorical
  • ATC, Anatomical Therapeutic Chemical; ICD-10, International Classification of Diseases - 10th version; OBS_NORM, measured laboratory value compared to normal laboratory test value.