Table 1

Patient inclusion and exclusion

	N	Excluded (N)
Patients with COPD with a J44 diagnosis at the age of 40+ years old registered in the Danish COPD registry with a least one measurement in the period 2008–2018	n
Exclude: Patients with index after 2015 (not 3 years follow-up)		N
Patients with COPD in the Danish COPD registry with first measurement 2008–2015	n
Exclude: Patients with pneumonia in all follow-up months, errors in registered data or unrealistic data values		N
Final study population: patients with COPD in the Danish COPD registry with first measurement 2008–2015	n