Baseline demographic characteristics of ITC US sample (N=6669)
| Characteristic | N | Per cent |
|---|---|---|
| Sex | ||
| Male | 3032 | (45.5) |
| Female | 3637 | (54.5) |
| Age | ||
| 18–24 | 749 | (11.2) |
| 25–39 | 1710 | (25.6) |
| 40–54 | 2436 | (36.5) |
| 55+ | 1774 | (26.6) |
| Race | ||
| Black | 668 | (10.1) |
| Other | 813 | (12.2) |
| White | 5163 | (77.7) |
| Education* | ||
| Low | 3037 | (45.6) |
| Moderate | 2547 | (38.2) |
| High | 1073 | (16.1) |
| No answer | 12 | (0.2) |
| Income† | ||
| Low | 2454 | (36.8) |
| Moderate | 2182 | (32.7) |
| High | 1542 | (23.1) |
| No answer | 491 | (7.4) |
| # of participants recruited at each survey wave | ||
| Wave 1 | 2140 | (32.1) |
| Wave 2 | 684 | (10.3) |
| Wave 3 | 889 | (13.3) |
| Wave 4 | 742 | (11.1) |
| Wave 5 | 745 | (11.1) |
| Wave 6 | 711 | (10.7) |
| Wave 7 | 382 | (5.7) |
| Wave 8 | 376 | (5.6) |
| # Surveys completed by respondents | ||
| 1 | 2969 | (44.5) |
| 2 | 1519 | (22.8) |
| 3 | 876 | (13.1) |
| 4 | 498 | (7.5) |
| 5 | 319 | (4.8) |
| 6 | 212 | (3.2) |
| 7 | 124 | (1.9) |
| 8 | 152 | (2.3) |
*Education defined as low=≤high school; moderate=some college/tech/trade school, no degree; high=university degree or greater.
†Income defined as low=≤$29 999; moderate=$30 000–$59 999; high ≥$60 000.
ITC, International Tobacco Control.