Table 1.
Baseline sample characteristics
| E-cigarettes (n = 571) | NRT (n = 569) | |
|---|---|---|
| Age (years), median (IQR) | 26.6 (22.5–30.9) | 27.3 (23.6–31.1) |
| Education, n (%) | ||
| Primary and secondary school | 229 (40.1) | 234 (41.1) |
| Further education | 288 (50.4) | 273 (48.0) |
| Higher education | 54 (9.5) | 62 (10.9) |
| Employed, n (%) | 274 (48.0) | 257 (45.2) |
| Ethnicity, n (%) | ||
| White British | 513 (89.8) | 495 (87.0) |
| Other | 58 (10.2) | 74 (13.0) |
| Cigarettes per day, median (IQR) | 10 (7–15) | 10 (7–15) |
| FTCD score, mean (s.d.) | 4.0 (2.1) | 4.3 (2.1) |
| Cotinine (ng ml−1) median (IQR)a | 111 (75.8–165) | 118 (73.9–176) |
| Lives with person who smokes, n (%) | 342 (59.9) | 328 (57.6) |
| Past treatment, n (%)b | ||
| Champix | 69 (12.1) | 79 (13.9) |
| NRT | 268 (46.9) | 273 (48.0) |
| Zyban | 7 (1.2) | 5 (0.9) |
| None | 272 (47.6) | 267 (46.9) |
| Tried e-cigarettes in the past, n (%) | 288 (50.4) | 267 (46.9) |
FTCD, Fagerstrom test of cigarette dependence.
aE-cigarettes, n = 529; NRT, n = 531 (cotinine at baseline was missing for 80 participants (7.0%), 53 due to insufficient samples and 27 due to loss at the hospital or in the mail).
bMore than one treatment could be selected.