Trends in youth smoking prevalence: Vermont campaign, 1985 to 1989
| Reported weekly smoking prevalence | ||||||
|---|---|---|---|---|---|---|
| Grade 6 1985 | Grade 7 1986 | Grade 8 1987 | Grade 9 1988 | Grade 10 1989 | Grade 12: 2 years postintervention 1991 | |
| Intervention | 1.3 | 1.8 | 5.01-150 | 9.11-150 | 12.81-150 | 161-150 |
| Control | 1.6 | 3.4 | 9.3 | 14.8 | 19.8 | 24 |
Source: Flynn et al.7
↵1-150 p ⩽ 0.05