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. 2023 Apr 20;10(1):e001478. doi: 10.1136/bmjresp-2022-001478

Figure 2.

Figure 2

Undiagnosed patients with postbronchodilator airflow obstruction in the total population studied (ES) relating to cross-sectional prevalence studies of sufficient sample size, grouped by risk categories. A pooled estimate was only reported in the main text if the degree of heterogeneity (I2) was <75% or if the 95% CIs of all studies within a risk category clearly overlapped. Undiagnosed clinical COPD could be confirmed in the subgroups of symptomatic persons (ie, smokers with symptoms or with symptoms/risk factors) and registries, and these patients did not have a diagnosis of COPD listed in their primary healthcare record. The abbreviation of ‘N’ refers to the total number of participants in the study. COPD, chronic obstructive pulmonary disease.

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