Table 1. Characteristics of subjects. Values are means (median; SEM).
Non-smokers (n=10) Smokers (n=10)
Age (years) 21.2
(20.0; 1.2)		 21.1
(20.0; 1.6)
Height (cm) 175.4
(175.0; 1.8)		 176.4
(176.5; 1.3)
Body mass (kg) 70.0
(72.7; 52.4)		 71.0
(70.0; 2.6)
Cigarettes per day NA 20.5
(20.0; 2.4)
Smoking years NA 4.8
(4.5; 1.0)
Cotinine (nmol· mg-1 creatinine) 3.97
(2.86; 1.46)		 17.78
(18.08; 2.90)**
NA, not applicable** p<0.01, compared to non-smokers.