Table 2. Properties of patients.

patient	sex	age	smoking	duration(years)	cigarretes/day	score
1	M	51	Yes	20	10	3
2	M	58	No	0	0	1
3	M	51	Yes	25	15	1
4	M	56	Yes	25	10	2
5	M	46	Yes	26	13	0
6	M	56	Yes	24	10	1
7	M	61	Yes	20	10	ND
8	F	59	Yes	25	10	3
9	F	32	Yes	12	13	3
10	M	52	Yes	30	10	ND
11	M	55	Yes	25	10	ND
12	M	69	Yes	40	20	2
13	M	52	No	0	0	0
14	W	56	No	0	0	0
15	M	50	Yes	30	5	3
16	F	41	No	0	0	1
17	M	27	No	0	0	1

M: male, F: female

ND: not determined