TABLE 3.
Sensitivity Analysis of Exposure to Antidrug Advertisements and Past-Month Marijuana Use Among Eighth-Grade Adolescent Girls in the United States: American Community Survey, 2006, and Monitoring the Future Study, 2006–2008
| Annual Antidrug Advertising Exposure Variable, TRPs/1000 | Model 1, AOR (SE) | Model 2, AOR (SE) | Model 3, AOR (SE) | Model 4, AOR (SE) |
| Depreciateda | 0.672** (0.087) | — | — | — |
| Past mob | — | 0.601** (0.092) | — | — |
| Cumulativec | — | — | 0.985 (0.025) | 0.871** (0.045) |
| Cumulative squared | — | — | — | 1.003* (0.001) |
Note. AOR = adjusted odds ratio; TRPs = targeted rating points. The outcome data came from the Monitoring the Future Study, 2006–2008. The advertising exposure data came from the Office of National Drug Control Policy. The sample was eighth-grade adolescent girls in the Monitoring the Future study; n = 21 710. We estimated multiple logistic regression models, and the outcome variable in all models was an indicator variable equal to 1 if the student reported past-month marijuana use. We report AORs for the relevant advertising exposure variable. The scale of the independent variables differed substantially in models 3 and 4 from that in models 1 and 2; thus, the AORs were not directly comparable across models. Models also controlled for survey year and region fixed effects, respondent age in months at time of survey, race/ethnicity dummies, parental education dummies, and market-level characteristics measured from the 2006 American Community Survey14 (population size, median household income, percentage of the population with at least a bachelor's degree, median age, and percentage of the population in rental housing). Observations were weighted with the Monitoring the Future student weight.
Past 4 months of TRPs with each month depreciated; λ = 0.3 (from Table 2).
No depreciation.
Total TRPs to date with no depreciation.
*P < .05; **P < .01.