Table 1 Numbers of participants and checkups
From: Long-term effectiveness of adolescent brief tobacco intervention: a follow-up study
| Â | Â | Control group (n = 1 238) | Intervention group (n = 1 348) | Average age | ||
|---|---|---|---|---|---|---|
| Â | Year | n | % of group | n | % of group | y. |
Dental checkup | Â | Â | Â | Â | Â | Â |
   First session | 1992 | 1,238 | 100 | 1,348 | 100 | 13.1 |
   Second session | 1993 | 1,029 | 83.1 | 1,149 | 85.2 | 14.2 |
   Third session | 1994 | 726 | 58.6 | 845 | 62.7 | 15.2 |
   Fourth session | 1994 | 247 | 20.0 | 305 | 22.6 | 15.6 |
Follow-up | 2008 | 491 | 39.7 | 529 | 39.2 | ~29 |