Table 1.

Demographic characteristics of the participants.

	Mean (SD)			Test value	P-value
	Non-smokers	Relapsers	Quitters
Age (years)	38.5 ± 7.4	39 ± 6.5	38 ± 7.3	0.160	0.852
Education (years)	15.4 ± 4.7	13.7 ± 2.6	14.1 ± 2.8	2.390	0.096
Age of smoking		20.1 ± 4.5	21.9 ± 6.2	−1.412	0.162
Smoking years		18.9 ± 6.4	16.1 ± 6.6	1.781	0.079
Cigarettes per day		23.6 ± 10.4	22.8 ± 9.2	0.335	0.739
Smoking index		445.5 ± 255.8	377.5 ± 233.9	1.149	0.254
FTND		5.4 ± 2.4	5.2 ± 1.9	0.320	0.750

FTND, Fagerstrom Test of Nicotine Dependence; Smoking index: (smoking years)* (cigarettes per day).