Fig. 1From: Identifying the associated risks of pneumonia in COPD patients: ARCTIC an observational studyStudy cohorts and criteria for patients with a doctor’s diagnosis of COPD and/or asthma. COPD chronic obstructive pulmonary disease; EMRs electronic medical records; ICS inhaled corticosteroids (low dose ICS: < 640 μg/day; high dose ICS: ≥800 μg/day)Back to article page