. Author manuscript; available in PMC: 2018 Apr 1.

Published in final edited form as: Acad Radiol. 2016 Dec 8;24(4):386–392. doi: 10.1016/j.acra.2016.10.011

Table 1.

Characteristics of the subjects in the baseline and of those with a second visit.

Characteristic	Baseline (N=8,156)	Subjects with a second visit (N=1,623)
Age, y	60 ± 9	61± 9
Male gender, %	55	52
African-American race, %	31	27
Height, cm	170 ± 9	170 ± 9
Weight, kg	82 ± 19	83 ± 18
Pack-years of smoking	44 ± 25	44 ± 24
Current smoking status, %	51	43
FEV₁, L	2.3 ± 1.0	2.3 ± 0.9
FEV₁ change, ml/yr	-	−41 ± 52
FEV₁, % predicted	78 ± 27	80 ± 25
FVC, L	3.4 ± 1.0	3.4 ± 1.0
FVC, % predicted	89 ± 18	91 ± 17
FEV₁/FVC ratio	0.65 ± 0.17	0.66 ± 0.16
%LAA-950, %	6.8 ± 10.0	7.1 ± 9.3
Lung mass, g	902 ± 183	884 ± 174
Subjects with COPD, %	50	50
One or more acute respiratory disease episode in the prior yr. to enrollment, %	21	18

Data are presented as mean ± SD or proportion (%)