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. Author manuscript; available in PMC: 2019 Dec 1.
Published in final edited form as: Chest. 2018 Jul 17;154(6):1301–1310. doi: 10.1016/j.chest.2018.07.002

Figure 2. Asthma/COPD overlap in WTC-exposed firefighters who had a bronchodilator PFT.

Figure 2.

The Venn diagram demonstrates abnormalities on bronchodilator PFTs obtained via the WTC treatment program. Isolated-asthma was diagnosed in 202 individuals who had FEV1 bronchodilator response of greater than 12% and 200 ml. Isolated-COPD was diagnosed in 215 individuals who had a post-bronchodilator FEV1 /FVC ratio <0.70. Asthma COPD/overlap was diagnosed in 99 who had both a FEV1 bronchodilator response >12% and 200 ml, and a FEV1/FVC ratio <0.70. The remainder of the study population (1,621) did not have a bronchodilator response or airflow limitation.