Table 1.
Characteristics of the patients in the three cohorts and in the overall sample.
Fig 1.
ROC curves of the FEV1/FEV6 ratio measured using the COPD-6 device to screen for chronic obstructive pulmonary disease in primary care (top left), community pharmacies (top right), emergency services (bottom left) and in the overall sample (bottom right).
Abbreviations: AUC, area under curve; CI, confidence interval; CPh, community pharmacies; ES, emergency services; GOLD, Global Initiative for Chronic Obstructive Lung Disease; PC, primary care; ROC, receiver operating characteristic.
Table 2.
Comparison of the area under the ROC curves of the FEV1/FEV6 ratio measured by the COPD-6 device, according to sex, age and smoking history.
Table 3.
Values for sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio and negative likelihood ratio for different cut-off points for the FEV1/FEV6 ratio determined during screening for COPD using the COPD-6 device in PC (gold standard criterion for comparison: post-bronchodilator spirometry FEV1/FVC <0.7).
Table 4.
Values for sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio and negative likelihood ratio for different cut-off points for the FEV1/FEV6 ratio determined during screening for COPD using the COPD-6 device in CPh (gold standard criterion for comparison: post-bronchodilator spirometry FEV1/FVC <0.7).
Table 5.
Values for sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio and negative likelihood ratio for the different cut-off points for the FEV1/FEV6 ratio determined during screening for COPD using the COPD-6 device in ES (gold standard criterion for comparison: post-bronchodilator spirometry FEV1/FVC <0.7).
Table 6.
Values for sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio and negative likelihood ratio for the different cut-off points for the FEV-1/FEV6 ratio determined during screening for COPD using the COPD-6 device in non-specialist healthcare settings (gold standard criterion for comparison: post-bronchodilator spirometry FEV1/FVC <0.7).