Table 1 Characteristics of research subjects

Sex (male)

14

13

16

9

Ethnicity (Caucasian)

23

14

10

17

Age (years)^a

64.21 ± 8.20

65.06 ± 6.64

36.09 ± 16.25

62.82 ± 4.78

BMI^a

24.47 ± 4.35

24.44 ± 4.13

23.67 ± 3.74

26.40 ± 3.90

Smoking status Never/Ex/Smoker

1/24/3

0/14/4

9/4/9

9/8/0

Cigarretes-year^b,c

7300 (730–25550)

7300 (1460–21900)

6387 (5475–14600)

7200 (1800–10800)