Table 4. Smoking status at baseline, 6-month follow-up and 1-year follow-up in the intervention group.

	Baseline	6-month follow-up	1-year follow-up
Mean daily cigarette consumption ± SD	15.39±11.35	3.92±5.65*	4.60±6.25*
Proportion of quitting (%)	0	40.5‡,* (39.8§,*)	35.8‡,* (33.0§,*)
Continuous abstinence rate of 6 month (%)	0	28.4‡,* (26.2§,*)	22.0‡,* (20.3§,*)
Stage of change (%)
Pre-contemplation	36.2	19.8	28.4
contemplation	44.8	26.7	27.4
Preparation	18	7.7	6.8
Action		12.1	11.7
Maintenance		28.4	24.1
Mean self-efficacy score ± SD
Emotional	−2.35±9.19	3.41±9.07*	2.21±9.79*
Social	−1.70±8.83	4.25±8.12*	2.51±9.23*,†
Skill	3.84±13.46	10.11±12.57*	6.30±15.32†
Relapse	3.06±9.77	6.58±8.99	4.49±11.35†
Attempt	2.36±5.46	4.55±5.21	3.25±1.47

* : Compared with baseline, p<0.05

† : Compared with 6-month follow-up survey, p<0.05

‡ : Analysis Set 1: The subjects with missing data were classified into two categories: those who have moved to an untraceable address as well as subjects who decline to be involved in subsequent data. The subjects who moved out were excluded from the denominator for calculating while those who declined to be involved in follow-up survey were counted as smokers.

§ : Analysis Set 2: The analysis was made on the most conservative assumption in which all lost to follow-up subjects were regarded as smokers.