Table 3:

Prevalence of emphysema on the CT scan by lung function trajectory group in the Year 20 CT scan.

	Trajectories of FEV1% (Y20 CT scan Data: n=2,660)
Year 20	Preserved Ideal Lung Health	Preserved Good Lung Health	Preserved Impaired Lung Health	Worsening Lung Health	Persistently Poor Lung Health
N (in whom Year 20 CT scan available)	160	1214	1084	153	49
Centrilobular N (%)	1 (0.6%)	12 (1.0%)	16 (1.5%)	5 (3.3%)	2 (4.1%)
Paraseptal	0 (0.0%)	17 (1.4%)	18 (1.7%)	11 (7.2%)	3 (6.1%)
Centrilobular or paraseptal	1 (0.6%)	24 (2.0%)	25 (2.3%)	13 (8.5%)	4 (8.2%)
Ever Smoker
N (ever smokers in whom Year 20 CT scan available)	47	413	392	83	19
Centrilobular N (%)	0 (0.0%)	9 (2.2%)	11 (2.8%)	5 (6.0%)	2 (10.5%)
Paraseptal	0 (0.0%)	16 (3.9%)	12 (3.1%)	7 (8.4%)	1 (5.3%)
Centrilobular or paraseptal	0 (0.0%)	21 (5.1%)	16 (4.1%)	9 (10.8%)	2 (10.5%)
Never Smoker
N (never smokers in whom Year 20 CT scan available)	111	790	682	68	29
Centrilobular N (%)	1 (0.9%)	3 (0.4%)	5 (0.7%)	0 (0.0%)	0 (0.0%)
Paraseptal	0 (0.0%)	1 (0.1%)	6 (0.9%)	3 (4.4%)	2 (6.9%)
Centrilobular or paraseptal	1 (0.9%)	3 (0.4%)	9 (1.3%)	3 (4.4%)	2 (6.9%)

Note that a subject may have centrilobular, paraseptal or both types of emphysema so the rows designated as “Centrilobular or paraseptal” are not a direct sum of their prevalence.