Table 2 Quit rate, smoking reduction rates and quit attempts in intervention and control groups

	Intervention group^c N = 268	Control group^d N = 260	P-value
Primary outcome at 6 months^a
Self-reported 7-day quit rate	42 (15.7)	43 (16.5)	0.79
Secondary outcome^a
Self-reported 7-day quit rate
1 month	43 (16.0)	54 (20.8)	0.16
3 months	49 (18.3)	45 (17.3)	0.77
9 months	40 (14.9)	49 (18.8)	0.23
12 months	40 (14.9)	53 (20.4)	0.10
Biochemically validated quit rate
6 months	14 (5.2)	10 (3.8)	0.45
Change of stage of readiness between 1- and 6-month
Decreased	26 (9.7)	18 (6.92)	0.37
No Change	161 (60.1)	167 (64.2)
Increased	44 (16.4)	37 (14.2)
Self-reported reduction in daily cigarette consumption ≥50%^b
6 months	45 (16.8)	32 (12.3)	0.14
12 months	28 (10.4)	25 (9.6)	0.75
At action stage of readiness to quit
6 months	42 (15.7)	44 (16.9)	0.67
12 months	37 (13.8)	49 (18.8)	0.12
Quit attempt to abstain smoking for >24 hrs since last assessment^b
6 months	21 (7.8)	21 (8.1)	1.00
12 months	20 (7.5)	24 (9.2)	0.35

^aBy intention-to-treat analysis: assume all non-responded follow-up patients as current smokers, who did not make a quit attempt over the period and did not change their behavior compared to baseline.
^bQuitters excluded from numerator.
^cBrief advice based on risk communication.
^dUsual care.

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