Derivation of normative data for the COPD assessment test (CAT)

Respiratory Research

Table 3 Predictors of a high CAT score ^a

Variable	OR (95% CI) for a high CAT score (≥95th percentile, score of 16) in non-COPD participants	Adjusted OR (95% CI) for a high CAT score^a
Male sex	0.44 (0.19,1.02)
Increase in age	1 (0.96, 1.04)
Current smoker	3.61 (1.27,10.25)	3.41 (1.05, 11.02)
FEV₁ percentage predicted	0.97 (0.95-0.99)	0.99 (0.96, 1.01)
Patient reported having asthma	8.24 (3.26,20.8)	7.59 (2.71, 21.25)
Patient reported having cardiovascular disease	1.59 (0.62,4.08)
Patient reported having musculoskeletal disease	3.8 (1.67,8.66)	4.09 (1.72, 9.71)
Variable	OR (95% CI) for a high CAT score (defined here as CAT score ≥ 10) in non-COPD participants	Adjusted OR (95% CI) for a high CAT score ^a
Male sex	0.62 (0.39,0.98)	0.66 (0.4, 1.08)
Increase in age	1 (0.98, 1.03)
Current smoker	1.64 (0.74, 3.65)
FEV₁ percentage predicted	0.97 (0.96-0.99)	0.98 (0.96, 0.99)
Patient reported having asthma	3.36 (1.58,7.92)	2.3 (1.02, 5.19)
Patient reported having cardiovascular disease	2.51 (1.47,4.3)	2.35 (1.32, 4.18)
Patient reported having musculoskeletal disease	1.56 (1, 2.46)	1.46 (0.9, 2.37)

CAT COPD assessment test; OR odds ratio.
^aTwo definitions of a high CAT score were used, the first was ≥95th percentile, and the second was ≥ 10, which is considered as the conventional cut-off.

ISSN: 1465-993X