Table 1. Characteristics of the participants.

Variables	Groups
	Nonsmokers (NS) n=16	Smokers (SM) n=15
Age (years)†	49 (44.25-61.75)	47 (33-52)
Gender n (%)
Female	10 (62.5)	6 (40)
Male	6 (37.5)	9 (60)
Ethnicity n (%)
White	11 (73.3)	8 (50)
Black	4 (26.6)	8 (50)
Cigarettes per day†	0	20 (10-20)
Duration of smoking habit†	0	23 (10-32)

*Statistically significant differences between NS and SM groups for baseline (Mann Whitney test; p<0.05)

†Values expressed in medians (percentile 25-percentile 75)