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Table 7 Perception of "harmfulness" of drugs: Percent of students in each group who answered "great risk."

From: The NARCONON™ drug education curriculum for high school students: A non-randomized, controlled prevention trial

  Control Drug Ed Significance Level
How much do you think people risk harming themselves (physically or in other ways), if they... Baseline N = 524 6-month follow-up N = 418 Baseline N = 434 6-month follow-up N = 290 p valuea
D5 smoke one or more packs of cigarettes per day? 66.0% 67.9% 65.2% 93.4% <0.001
D6 try marijuana once or twice? 38.5% 41.6% 30.6% 53.4% <0.001
D7 smoke marijuana regularly? 70.4% 72.7% 61.8% 87.2% <0.001
D8 take one or two drinks nearly every day? 24.4% 33.5% 19.8% 55.2% 0.010
D9 have five or more drinks once or twice each weekend? 39.7% 44.7% 35.3% 71.4% 0.343
  1. aControlling for baseline differences by using an analysis of covariance with a Type III sums of squares