| Univariate analysis | Multivariate analysis | |||
| OR (95% CI) | p-value | OR (95% CI) | p-value | |
| Test result | ||||
| Only negative | 1.00 | |||
| ≥1 indeterminate | 1.33 (0.87–2.04) | 0.19 | ||
| Test result in the previous 12 months | ||||
| Negative | 1.00 | |||
| Indeterminate | 1.26 (0.48–3.30) | 0.64 | ||
| Age | 1.02 (0.98–1.07) | 0.31 | ||
| Level of education | ||||
| Low | 1.00 | 0.09 | ||
| Medium | 1.14 (0.65–1.98) | 0.65 | ||
| High | 1.73 (1.06–2.84) | 0.029 | ||
| Cigarettes per day | 0.99 (0.96–1.02) | 0.40 | ||
| Smoking duration yrs | 1.01 (0.97–1.05) | 0.58 | ||
| Starting age yrs | ||||
| <15 | 1.00 | 0.09 | ||
| 15–20 | 1.70 (0.88–3.29) | 0.12 | ||
| >20 | 0.95 (0.40–2.27) | 0.91 | ||
| Time to first cigarette min | ||||
| <5 | 1.00 | 0.005 | 1.00 | 0.006 |
| 5–30 | 1.99 (0.96–4.09) | 0.06 | 1.94 (0.94–4.00) | 0.08 |
| 30–60 | 1.26 (0.56–2.85) | 0.58 | 1.28 (0.56–2.89) | 0.56 |
| >60 | 3.42 (1.56–7.51) | 0.002 | 3.39 (1.55–7.45) | 0.002 |
| Motivation to quit smoking | ||||
| Immotive | 1.00 | 0.55 | ||
| Pre-contemplator | 0.80 (0.38–1.66) | 0.55 | ||
| Contemplator | 1.25 (0.75–2.07) | 0.39 | ||
| Preparator | 1.32 (0.69–2.51) | 0.40 | ||
Low educational level: primary, lower secondary general or lower vocational education; medium educational level: intermediate vocational education or higher secondary education; high educational level: higher vocational education or university. Immotive: no intention to stop smoking within 1 yr or later; pre-contemplator: intention to stop smoking within 6–12 months; contemplator: intention to stop smoking within 1–6 months; preparator: intention to stop smoking within the next month. Bold indicates statistical significance.