Fig. 3

Bland–Altman plots of CAAT and CAT total scores in asthma + COPD, COPD, and both. Each small circle represents one patient, with the difference between CAAT and CAT total scores (CAT score – CAAT score) plotted against the average of the two scores. Jittering has been added to panel A for clarity where there were multiple superimposed circles. The central line shows the mean difference between the two measures, while the upper and lower lines show the limits of agreement (± 1.96 SD). Data for six patients who did not meet inclusion criteria have been excluded. CAAT Chronic Airways Assessment Test, CAT COPD Assessment Test, COPD chronic obstructive pulmonary disease, N total number of patients in the sample, SD standard deviation