Table 3.
Step 1. Adjusted odds ratio (95% CI) | Step 2. Adjusted odds ratio (95% CI) | Step 3. Adjusted odds ratio (95% CI) | |
Delay | |||
On the day | Ref | Ref | Ref |
1–6 days | 0.65 (0.52–0.82) | 0.72 (0.56–0.91) | 0.78 (0.61–1.00) |
1 week or more | 1.13 (0.91–1.41) | 1.07 (0.85–1.35) | 1.03 (0.81–1.32) |
Already stopped | 0.93 (0.70–1.23) | 0.91 (0.68–1.23) | 0.92 (0.68–1.25) |
Gender | |||
Female | Ref | Ref | Ref |
Male | 1.09 (0.91–1.31) | 1.11 (0.92–1.34) | 1.20 (0.99–1.48) |
Age (years) | |||
18–24 | Ref | Ref | Ref |
25–39 | 1.39 (0.83–2.34) | 1.53 (0.88–2.68) | 1.61 (0.93–2.79) |
40–54 | 1.04 (0.62–1.74) | 1.24 (0.71–2.15) | 1.42 (0.83–2.44) |
55+ | 1.17 (0.70–1.96) | 1.50 (0.86–2.60) | 1.71 (0.99–2.94) |
Socioeconomic status | |||
Low | Ref | Ref | Ref |
Moderate | 1.12 (0.90–1.40) | 1.07 (0.85–1.34) | 1.07 (0.84–1.37) |
High | 1.33 (1.06–1.66) | 1.14 (0.91–1.44) | 1.19 (0.93–1.51) |
Country | |||
Canada | Ref | Ref | Ref |
US | 1.24 (0.94–1.64) | 1.24 (0.94–1.64) | 1.38 (1.03–1.85) |
UK | 1.74 (1.34–2.26) | 1.55 (1.19–2.03) | 1.66 (1.25–2.20) |
Australia | 1.40 (1.09–1.80) | 1.35 (1.04–1.75) | 1.55 (1.18–2.04) |
Wave | |||
5 | Ref | Ref | Ref |
6 | 0.89 (0.76–1.05) | 0.85 (0.71–1.01) | 0.82 (0.68–0.99) |
Nicotine dependence | |||
Low | Ref | Ref | Ref |
Moderate | — | 0.75 (0.60–0.93) | 0.79 (0.63–0.99) |
High | — | 0.54 (0.41–0.70) | 0.57 (0.43–0.75) |
Used medication to stop smoking | |||
No | Ref | Ref | Ref |
Yes | — | 1.02 (0.84–1.23) | 1.00 (0.82–1.23) |
Made other attempt/s since last survey | |||
No | Ref | Ref | Ref |
Yes | — | 0.32 (0.26–0.39) | 0.49 (0.39–0.61) |
Method to quit | |||
Stopped abruptly | Ref | Ref | |
Cut down to quit | 0.68 (0.55–0.84) | 0.77 (0.62–0.96) | |
Quit attempt recency | |||
< 1month | Ref | Ref | Ref |
1–3 months | — | — | 1.43 (0.97–2.11) |
4–6 months | — | — | 2.22 (1.50–3.29) |
>6 months | — | — | 6.15 (4.25–8.91) |