Table 1

Intervention and counterfactual group definitions

Prescribing Information System (PIS)Scottish Morbidity Record – 01 Inpatient (SMR01)
InterventionBNF: 3.2 Inhaled steroids
Fee: paid
Age group: >18 years to <60 years
ICD-10: J20, J40X, J41, J42, J43, J44, J45, J46 or J47
Age group: >18 years to <60 years
Condition-based counterfactualBNF: 6.1.1 or 6.1.2
Fee: exempt E—medical exemption
Age group: >18 years to <60 years
ICD-10: E10, E11, E12, E13 or E14
Age group: >18 years to <60 years
Age-based counterfactualBNF: 3.2 Inhaled steroids
Fee: exempt A: <16 years, B: ≥16 years to ≤18 years and in full time education or C: ≥60 years
Age group: <16 years, ≥16 years to ≤18 years or ≥60 years
ICD-10: J20, J40X, J41, J42, J43, J44, J45, J46 or J47
Age group: <16 years, ≥16 years to ≤18 years or ≥60 years
  • BNF, British National Formulary; ICD-10, International Classification of Disease 10th version.