Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of COPD based on self-reported data and based on Electronic Medical Records compared with COPD based on spirometry–LLN and GOLD-definition.

Agreement between the three different data sources was determined with Cohen’s Kappa.采用科恩κ系数（Cohen's Kappa）对三种不同数据源之间的一致性进行了评估。