Table 2.

Mean CAT score difference by COPD status (stable, worsening, and exacerbation visits)

Assessment of COPD status (n=354)	CAT score, mean difference (95% confidence interval)	P-value
Patients global assessment
Stable–stable (n=286)	0.05 (−0.37–0.46)	0.817
Stable–worsening (n=68)	6.07 (4.95–7.19)	<0.0001
Physician global assessment
Stable–stable (n=298)	0.18 (−0.23–0.60)	0.389
Stable–mild exacerbation (n=37)	5.51 (4.39–6.63)	<0.0001
Stable–moderate exacerbation (n=19)	8.84 (6.29–11.39)	<0.0001
Mild–moderate exacerbation	3.22 (0.46–5.98)	0.007

Note: Data are mean difference (95% confidence interval).

Abbreviations: CAT, COPD Assessment Test; COPD, chronic obstructive pulmonary disease.