Fig. 1From: Chronic Airways Assessment Test: psychometric properties in patients with asthma and/or COPDMean boundary threshold difference between asthma and COPD for CAAT items by effect size units. Each CAAT item was scored between 0 and 5. Effect size units were calculated using Cohen’s d. A negative value indicates a lower response in patients with asthma. The overall mean was calculated as the standardised mean difference from a meta-analysis using a random effects model. Error bars represent 95% confidence intervals. CAAT Chronic Airways Assessment Test, COPD chronic obstructive pulmonary diseaseBack to article page