Chronic Airways Assessment Test: psychometric properties in patients with asthma and/or COPD

Respiratory Research

Table 3 Pearson’s correlations between CAAT score and patient-reported outcomes or clinical assessments

Variable^a	Asthma (N = 510)	Asthma + COPD (N = 510)	COPD (N = 510)	Total sample (N = 1530)
SGRQ total score
Patients with data available, n	500	502	501	1503
Pearson’s correlation coefficient	0.79***	0.81***	0.76***	0.79***
EQ-5D-5L VAS
Patients with data available, n	434	451	450	1335
Pearson’s correlation coefficient	−0.53***	−0.56***	−0.57***	−0.57***
CAT total score^b
Patients with data available, n	NA	66	211	277
Pearson’s correlation coefficient	NA	0.88***	0.90***	0.90***
Post-bronchodilator FEV₁ (% predicted)
Patients with data available, n	400	433	420	1253
Pearson’s correlation coefficient	−0.26***	−0.23***	−0.30***	−0.31***

CAAT Chronic Airways Assessment Test, CAT COPD Assessment Test, COPD chronic obstructive pulmonary disease, EQ-5D-5L VAS EuroQol 5-dimensions 5-level visual analogue scale, FEV₁ forced expiratory volume in 1 s, N total number of patients in the sample, n number of patients in sample with available data, NA not applicable, SGRQ St George’s Respiratory Questionnaire
^aAnalyses were performed for patients with non-missing data; thus, number of observations differed for each variable
^bTo achieve an appropriate sample size, analysis of the CAT was performed in all NOVELTY patients who completed both the CAAT and CAT (N = 277). Correlation coefficients > 0.70 were regarded as strong; 0.4–0.7 moderate; and < 0.4 weak
^***p < 0.0001

ISSN: 1465-993X