Table 3.

Univariate analysis of predictive value of CAT, CCQ, COPDSS, and AQ20 scores for composite event according to the best identified cutoffs

Variable	B	HR	95% CI	P-value
CAT ≥13.5	0.357	1.430	1.115–1.833	0.005
CCQ ≥2	0.310	1.364	1.063–1.749	0.015
COPDSS ≥9.5	0.132	1.141	0.877–1.484	0.32
AQ20 ≥8	0.270	1.310	1.020–1.683	0.035

Abbreviations: AQ20, Airways Questionnaire; B, beta coefficient; CAT, COPD Assessment Test; CCQ, Clinical COPD Questionnaire; CI, confidence interval; COPDSS, COPD Severity Score; HR, hazard ratio.