Table 3. Findings in CT correlated with the cigarette consumption.

CT findings	Smoke burden (pack years)				Total (n=85)
	<20 (n=33)	20–<40 (n=30)	40–<60 (n=13)	≥60 (n=9)
Interlobular	16 (48%)a	22 (73%)	11 (84%)	5 (56%)	54 (64%)
Intralobular	15 (45%)a	21 (70%)	10 (77%)	6 (67%)	52 (61%)
Micronodules	2 (6%)	2 (7%)	1 (8%)	2 (22%)	8 (9%)
Ground glass	1 (3%)	3 (10%)	1 (8%)	1 (11%)	6 (7%)
Bronchial wall thickening	20 (61%)	16 (53%)	11 (84%)	7 (78%)	54 (64%)
Emphysema	13 (40%)a	20 (67%)	12 (92%)	8 (89%)	53 (62%)

^aSignificant difference compared with the other groups.