Table 3 Logistic regression showing factors associated with self-reported smoking cessation for at least 30 days at 12-month follow-up

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)^†