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

Table 2.

Bronchodilator PFT Results

Variable	Asthma/COPD Overlap	Isolated-Asthma	Isolated-COPD	Neither Diagnosis
Pre-BD FEV₁ % predicted	67.3 ± 14.8	80.9 ± 13.5^a	82.3 ± 15.2^a	96.9 ± 13.2^a
Post-BD FEV₁ % predicted	81.3 ± 14.5	96.2 ± 13.7^a	85.9 ± 15.0^a	100.5 ± 13.5^a
Pre-BD FVC % predicted	93.3 ± 15.8	87.1 ± 13.9^a	101.2 ± 15.1^a	98.3 ± 12.9^a
Post-BD FVC % predicted	101.8 ± 14.0	96.0 ± 13.3^a	103.4 ± 15.1	98.5 ± 12.9^a
Pre-BD FEV₁/FVC	0.56 ± 0.08	0.73 ± 0.07^a	0.62 ± 0.07^a	0.77 ± 0.05^a
Post-BD FEV₁/FVC	0.62 ± 0.07	0.78 ± 0.05^a	0.64 ± 0.06^a	0.80 ± 0.05^a
Pre-BD RV/TLC	0.40 ± 0.10	0.33 ± 0.09^a	0.33 ± 0.08^a	0.28 ± 0.07^a

Data are expressed as mean ± SD. RV = residual volume; TLC = total lung capacity. See Table 1 legend for expansion of other abbreviations.

P < .05 vs asthma/COPD overlap subgroup.