Table 1.
Sample characteristics at baseline.
| Whole sample (n = 1498) | Exclusive smokers (n = 1089) | Dual users of NRT (n = 117) | Dual users of e-cigarettes (n = 292) | p1 | ||
|---|---|---|---|---|---|---|
| Age in years, % (n) | ||||||
| 16–24 | 8.6 (1 2 9) | 9.1 (99) | 4.3 (5) | 8.6 (25) | 0.020 | |
| 25–34 | 10.8 (1 6 2) | 10.4 (1 1 3) | 8.5 (10) | 13.4 (39) | – | |
| 35–44 | 13.9 (2 0 8) | 12.4 (1 3 5) | 14.5 (17) | 19.2 (56) | – | |
| 45–54 | 20.0 (3 0 0) | 20.1 (2 1 9) | 24.8 (29) | 17.8 (52) | – | |
| 55–64 | 23.6 (3 5 3) | 24.1 (2 6 2) | 19.7 (23) | 23.3 (68) | – | |
| ≥65 | 23.1 (3 4 6) | 24.0 (2 6 1) | 28.2 (33) | 17.8 (52) | – | |
| Female sex, % (n) | 47.9 (7 1 7) | 48.0 (5 2 3) | 54.7 (64) | 44.5 (1 3 0) | 0.173 | |
| White ethnicity, % (n) | 94.1 (1410) | 93.9 (1023) | 94.9 (1 1 1) | 94.5 (2 7 6) | 0.874 | |
| Social grade C2DE, % (n) | 50.6 (7 5 8) | 51.3 (5 5 9) | 51.3 (60) | 47.6 (1 3 9) | 0.521 | |
| Cigarettes per day, mean (SD) | 12.59 (9.37) | 12.47 (9.34) | 12.85 (9.08) | 12.96 (9.61) | 0.694 | |
| Strength of urges (0–5), mean (SD) | 2.01 (1.10) | 1.93 (1.11) | 2.27 (1.12) | 2.22 (0.99) | <0.001 | |
| High motivation to quit, % (n) | 12.8 (1 9 1) | 9.5 (1 0 3) | 30.8 (36) | 17.8 (52) | <0.001 | |
| Attempted to quit in past 12 months, % (n) | 27.5 (4 1 2) | 19.5 (2 1 2) | 53.0 (62) | 47.3 (1 3 8) | <0.001 | |
| Dual use for harm reduction, % (n) | – | – | 91.5 (1 0 7) | 94.9 (2 7 7) | 0.193 | |
1p value for the association between each variable and group (dual use of e-cigarettes, dual use of NRT, and exclusive smoking).