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. 2019 May 13;14:995–1008. doi: 10.2147/COPD.S195382

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© 2019 Larsson et al.

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Study cohorts and criteria for early versus late COPD diagnosis. ^aIndicator diagnosis codes; Pneumonia J10–J18; respiratory diseases J00–J99, excluding pneumonia; oral steroids H02AB; antibiotics for respiratory disease J01AA, J01CA; prescription for respiratory disease R01–R03, R05–R07; lung function measurements from spirometry database and laboratory module in EMR. Disposition of patients by COPD and concomitant asthma versus COPD only is based on diagnosis at any time during the patient’s disease history.

Abbreviation: EMR, electronic medical records.