Changes in perception indices over time among 12–17 year olds
| Type of state campaign | Period 1 | Period 2 | Period 3 | % point change from period 1–3 |
|---|---|---|---|---|
| Figures in parenthesis denote the 95% confidence interval. | ||||
| *Significantly different at the 5% level. | ||||
| †Significant difference at the 5% level between established states and other (non-campaign) states. | ||||
| ‡Significant difference at the 5% level between new campaign states and other (non-campaign) states. | ||||
| §Significant difference at the 5% level between established campaign states and newer states. | ||||
| Perception of tobacco industry index (α = 0.74) | ||||
| Established states (CA, FL, and MA) | 20.74†§ (20.39 to 21.10) | 21.24†§ (21.06 to 21.42) | 21.15† (20.92 to 21.38) | 1.98% |
| Newer states (IN, MS, MN, and NJ) | 19.78§ (19.15 to 20.40) | 20.41§ (19.99 to 20.83) | 20.94 (20.59 to 21.29) | 5.86%* |
| All other states | 19.64† (19.37 to 19.90) | 20.20† (19.98 to 20.42) | 20.69† (20.54 to 20.85) | 5.35%* |
| Perception of smoking index (α = 0.51) | ||||
| Established states (CA, FL, and MA) | 20.39 (20.07 to 20.70) | 20.78 (20.63 to 20.93) | 20.57† (20.34 to 20.79) | 0.88% |
| Newer states (IN, MS, MN, and NJ) | 20.09 (19.30 to 20.88) | 20.80 (20.57 to 21.03) | 20.88 (20.57 to 21.20) | 3.93% |
| All other states | 20.56 (20.36 to 20.76) | 20.81 (20.67 to 20.95) | 20.78† (20.65 to 20.90) | 1.07% |