Abstract S130 Table 1

Smoking status and severity of COPD on spirometry and severity of emphysema on LDCT. Shaded columns represent the patients within that category who reported a pre-existing diagnosis of COPD or emphysema.

		Severity of COPD based on NICE criteria for COPD (2004) (3)*
Normal		Mild		Moderate		Severe		Totals
# Cases	% with PMHx COPD	# Cases	% with PMHx COPD	# Cases	% with PMHx COPD	# Cases	% with PMHx COPD	# Cases	% with PMHx COPD
Smoking Status	No smoking data	0		0		1	100%	0		1	100%
	Current smoker	76	10.5%	39	12.8%	46	30.4%	18	50.0%	179	20.1%
	Former smoker	43	11.6%	13	23.1%	19	36.8%	5	40.0%	80	21.3%
	Occasional smoker	7	0%	4	0%	2	50.0%	2	50.0%	15	13.3%
Total		126	10.3%	56	14.3%	68	33.8%	25	48%	275	20.4%
		Severity of Emphysema on CT
Not present		Mild		Moderate		Severe		Totals
# Cases	% with PMHx COPD	# Cases	% with PMHx COPD	# Cases	% with PMHx COPD	# Cases	% with PMHx COPD	# Cases	% with PMHx COPD
Smoking Status	Current smoker	37	5.4%	40	17.5%	25	28.0%	8	75.0%	110	20.0%
	Former smoker	28	14.2%	16	31.3%	8	12.5%	3	66.7%	55	21.8%
	Occasional smoker	5	0%	1	0%	0	0%	2	50.0%	8	12.5%
Total		70	8.6%	57	21.1%	33	24.2%	13	69.2%	173	20.2%

*Spirometry values are pre-bronchodilator results, categorised by severity according to 2004 NICE criteria: National Collaborating Centre for Acute and Chronic Conditions. Chronic obstructive pulmonary disease in over 16s: diagnosis and management. 2010;(June).