Table 3. Smoking and quitting factors associated with e-cigarette awareness, use and perceived effectiveness on quitting.
| Awareness | Use | Perceived effectiveness | ||||
|---|---|---|---|---|---|---|
| OR (95% CI) | AOR (95% CI) a | OR (95% CI) | AOR (95% CI) a | OR (95% CI) | AOR (95% CI) a | |
| Duration of smoking | 0.97 (0.96–0.98)*** | 1.04 (1.01–1.07)** | 0.97 (0.96–0.99)*** | 1.10 (0.69–1.74) | 0.98 (0.97–1.00) | 0.97 (0.94–1.00) |
| Heaviness smoking index | 1.11 (1.00–1.23)* | 1.16 (1.03–1.30)* | 1.15 (1.03–1.29)* | 1.30 (1.14–1.48)*** | 1.08 (0.96–1.22) | 1.11 (0.97–1.27) |
| Last quit attempt | ||||||
| Never | 1 | 1 | 1 | 1 | 1 | 1 |
| ≥1 year | 1.48 (1.00–2.18) | 1.43 (0.94–2.18) | 1.36 (0.87–2.12) | 1.38 (0.86–2.23) | 1.96 (1.14–3.38)* | 2.24 (1.22–4.11)* |
| <1 year | 1.61 (0.95–2.73) | 1.47 (0.83–2.63) | 0.89 (0.48–1.63) | 0.76 (0.39–1.45) | 2.24 (1.18–4.25)* | 2.58 (1.28–5.18)* |
| <1 month | 1.28 (0.69–2.39) | 1.20 (0.60–2.37) | 2.16 (1.18–3.96)* | 1.80 (0.94–3.46) | 1.40 (0.60–3.23) | 1.03 (0.52–3.27) |
| P for trend | 0.18 | 0.33 | 0.11 | 0.45 | 0.15 | 0.22 |
| Ever quit for ≥24 hours | ||||||
| No | 1 | 1 | 1 | 1 | 1 | 1 |
| Yes | 1.41 (0.98–2.02) | 1.35 (0.91–1.98) | 1.37 (0.90–2.06) | 1.31 (0.84–2.04) | 1.88 (1.14–3.11)* | 2.11 (1.20–3.68)* |
| Intention to quit/reduce | ||||||
| <7 days | 1 | 1 | 1 | 1 | 1 | 1 |
| <30 days | 0.90 (0.59–1.39) | 0.77 (0.48–1.22) | 1.05 (0.66–1.67) | 0.92 (0.55–1.55) | 1.30 (0.80–2.10) | 1.22 (0.72–2.06) |
| <60 days | 3.03 (0.93–9.93) | 2.56 (0.76–8.59) | 1.94 (0.98–3.86) | 2.16 (1.05–4.44)* | 1.56 (0.70–3.45) | 1.41 (0.60–3.31) |
| No | 0.87 (0.50–1.51) | 0.73 (0.40–1.33) | 1.40 (0.81–2.45) | 1.48 (0.83–2.64) | 0.72 (0.34–1.54) | 0.66 (0.29–1.50) |
| P for trend | 0.90 | 0.56 | 0.09 | 0.08 | 0.93 | 0.69 |
| Assisted quit methods | ||||||
| None | 1 | 1 | 1 | 1 | 1 | 1 |
| Any | 0.94 (0.57–1.54) | 1.01 (0.59–1.72) | 1.37 (0.87–2.18) | 1.38 (0.83–2.28) | 1.34 (0.81–2.23) | 1.46 (0.86–2.50) |
| Perception on quitting | ||||||
| Importance | 1.05 (0.98–1.13) | 1.06 (0.99–1.15) | 1.06 (0.98–1.15) | 1.08 (0.38–1.57) | 1.14 (1.03–1.26)* | 1.16 (1.04–1.29)* |
| Confidence | 1.01 (0.94–1.08) | 1.04 (0.96–1.12) | 0.94 (0.88–1.01) | 0.95 (0.88–1.02) | 1.01 (0.93–1.09) | 0.99 (0.91–1.08) |
| Difficulty | 1.05 (0.98–1.12) | 1.02 (0.96–1.10) | 1.00 (0.94–1.08) | 1.00 (0.92–1.07) | 1.02 (0.95–1.10) | 1.02 (0.94–1.11) |
| E-cigarette use | ||||||
| No | - | - | - | - | 1 | 1 |
| Yes | - | - | - | - | 3.44 (2.23–5.29)*** | 3.24 (2.03–5.17)*** |
a Adjusting for sex, age, education and income.
* P<0.05,
** P<0.01,
*** P<0.001.