Table 1. Baseline characteristics of the smokers and nonsmokers.

	Nonsmoker n=15	Smoker n=11	P-value
Age	35 (26.5–36.5)	36 (29.5–37.5)	0.406
Male, n (%)	11 (73.3%)	11 (100%)	0.063
BMI	22 (19.7–23.1)	19.8 (18.4–21.2)	0.139
Pack years	0	8.25 (4.1–12.8)	<0.001

Continuous data were expressed as median and interquartile range (IQR), and categorical data as number and ratio. Mann–Whitney U test was performed for continuous data, and the Chi-square test was for categorical data.

Abbreviations: BMI, body mass index; Pack year, calculated by multiplying the number of packs of cigarettes smoked per day by the number of years.