Table 1. Demographic characteristics of subjects according to active smoking status.

Sex	Smoking status
Parameter	Current smokers	Ex-smokers	Never smokers
Males
Number of subjects	45	40	34
Age (year)
Median	59	61	61
Range	39 - 69	42 - 69	41 - 69
Age at starting smoking (year)
Median	20	20	NE
Range	16 - 26	18 - 58	NE
Number of cigarettes smoked per day
Median	20	20	NE
Range	10 - 60	5 - 35	NE
Females
Number of subjects	12	4	105
Age (year)
Median	48	55	61
Range	40 - 64	50 - 56	40 - 69
Age at starting smoking (year)
Median	23	25	NE
Range	20 - 44	20 - 27	NE
Number of cigarettes smoked per day
Median	20	4	NE
Range	1 - 30	3 - 13	NE

NE: not evaluable.