. 2018 Jul 17;154(6):1301–1310. doi: 10.1016/j.chest.2018.07.002

Table 4.

Marginal Cox Regression Models Predicting Isolated-Asthma, Isolated-COPD, and Asthma/COPD Overlap

Variable	Asthma/COPD Overlap vs Isolated-Asthma			Asthma/COPD Overlap vs Isolated-COPD
Variable	HR	95% CI	P Value	HR	95% CI	P Value
Eosinophils ≥ 300 cells/μL^a	2.00	1.11-3.62	.02	1.60	0.89-2.85	.12
Accelerated FEV₁ decline	1.02	0.60-1.74	.94	0.99	0.60-1.65	.98
Ever-smoker	1.19	0.69-2.05	.52	0.57	0.34-0.98	.04
WTC exposure morning of 9/11	0.88	0.49-1.61	.68	1.62	0.88-3.01	.12

The total N value was 2,124 due to missing covariates. Data were adjusted for age, race, BMI, and first post-9/11 FEV₁/FVC measurement. See Table 1 and 3 legends for expansion of abbreviations.

First post-9/11 measurement.