Table 4 Factors predicting the willingness to stop smoking (daily smokers N = 1172).

Variable	Univariate analysis				Multivariate analysis
Variable	N^a (%)	OR^b	95% Cl	p value	OR^b	95% Cl	p value
Age (in years) cigarette users
Mean 19.5, SD ± 1.3	1 095	1.12	1.02–1.22	0.014
Educational level^a
Total	1 090			0.674
Comprehensive school (reference)	239 (22%)	1
Vocational school	661 (61%)	1.11	0.83–1.48	0.479
Upper secondary education	190 (17%)	1.17	0.81–1.68	0.396
Dual use of cigarettes and snus	1 086	1.25	0.86–1.82	0.236
Duration of smoking (years)
Mean 4.85, SD ± 2.1	1 087	0.95	0.90–1.00	0.071
Perceived harmfulness of smoking
Total	1 082			< 0.001
Not at all	37 (3%)	1			1
Neither harmless nor harmful	223 (21%)	1.37	0.64–2.96	0.421	1.43	0.59–3.41	0.427
Clearly harmful	822 (76%)	2.93	1.41–2.48	0.004	2.28	0.98–5.32	0.057
Quit attempts of use
Total	1 068			< 0.001
No attempts	561 (53%)	1			1
One	317 (30%)	2.71	2.08–3.54	< 0.001	2.34	1.77–3.10	< 0.001
Two or more	190 (18%)	3.68	2.68–5.05	< 0.001	3.22	2.32–4.49	< 0.001
Perceived addictiveness of smoking
Total	1 084			< 0.001
Not at all	48 (4%)	1			1
Neither nor	192 (18%)	1.02	0.55–1.91	0.941	0.99	0.50–1.95	0.971
Very addictive	844 (78%)	1.88	1.07–3.32	0.028	1.74	0.93–3.26	0.086
Advice to quit smoking
Total	1084	1.83	1.34–2.61	< 0.001	1.65	1.17–2.32	0.004
Level of cigarette dependence
Total	1 095			< 0.001
No/low dependence	541 (49%)	1			1
Moderate	261 (24%)	0.87	0.66–1.15	0.322	0.99	0.74–1.33	0.947
Strong	205 (19%)	0.51	0.37–0.70	< 0.001	0.63	0.44–0.89	0.008
Very strong	88 (8%)	0.35	0.22–0.56	< 0.001	0.43	0.26–0.71	0.001

Relative order of the outcome values used in the regression: not willing to quit; willing to quit after 6 months; willing to quit within 6 months.
OR^a Univariate analysis: information missing for 77/1095 cases.
OR^b Multivariate analysis: information missing for 51/1044 cases.

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