Table 1.

Patient demographic characteristics.

Variables	N = 25
Age, years	23.0 ± 3.4 (20–35)
Male	28 (100%)
BMI, kg/m2	22.8 ± 2.6 (18.0–29.4)
Smoking data
Smokers	16 (64.0%)
Years of smoking	5.4 ± 3.4 (1–15)
Cigarettes per day	11.2 ± 6.0 (2–30)
Pack-years	5.3 ± 6.9 (0.5–24)
Non-smokers	9 (36.0%)

Results are presented as mean ± standard deviation (range) or as n (%).