Table 3.

Logistic regression showing factors associated with self-reported smoking cessation for at least 30 days at 12-month follow-up

	Odds of self-reported cessation at 12 months
	Model 1	Model 2
AIC	192.903	273.855
Variables included in the model	Adjusted odds ratio (95% CI)	Adjusted odds ratio (95% CI)
Age, years	0.99 (0.95 – 1.04)	1.00 (0.96 – 1.04)
Highest level of education attained
Lower secondary and less*	Reference
Upper secondary	0.41 (0.16 – 1.04)	0.63 (0.31 – 1.30)
University degree, or equivalent, or higher	0.87 (0.27 – 2.76)	1.09 (0.42 – 2.81)
Average number of cigarettes/days	1.03 (0.98 – 1.08)	-
Fagerström Test for Cigarette Dependence
Low (< 4)	Reference	-
Moderate (4–6)	1.44 (0.42 – 4.89)	-
High (7–10)	0.36 (0.09 – 1.46)	-
Years smoking (for each additional year)	0.99 (0.94 – 1.04)	1.01 (0.97 – 1.04)
Ever attempted to quit in the past	1.39 (0.50 – 3.85)	1.29 (0.62 – 2.66)
Drink alcohol every day	1.11 (0.47 – 2.59)	1.35 (0.71 – 2.58)
Drink caffeinated drinks every day	0.62 (0.24 – 1.61)	0.74 (0.37 – 1.50)
Living with at least one other smoker	1.22 (0.41 – 3.63)	0.92 (0.42 – 1.99)
Reasons given to quit (Yes vs. No)
Personal health condition	0.47 (0.06 – 3.57)	1.17 (0.22 – 6.28)
Family’s health	0.69 (0.13 – 3.64)	2.08 (0.68 – 6.38)
Expense	0.21 (0.02 – 2.62)	0.20 (0.02 – 1.84)
Advised to quit by referral doctor	1.23 (0.31 – 4.89)	1.36 (0.46 – 4.00)
Received written material from referral doctor	0.97 (0.40 – 2.35)	0.83 (0.44 – 1.56)
Days from baseline to target quit date
14 days or more, or did not decide a target quit date	Reference	Reference+
Less than 14 days	1.75 (0.69 – 4.43)	2.23 (1.06 – 4.67)†
Number of successful counselling phone calls completed by Quitline (maximum 8 calls offered)
5 calls or less	Reference	Reference
6 – 7 calls	7.46 (1.53 – 36.24)†	3.86 (1.28 – 11.67)†
8 calls	12.17 (2.87 – 51.69)†	6.98 (2.50 – 19.49)†

^*Combined due to small numbers in less than primary and primary levels

^†Statistically significant (p < 0.05)