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. Author manuscript; available in PMC: 2008 Sep 6.
Published in final edited form as: Drug Alcohol Depend. 2007 Mar 26;90(1):12–24. doi: 10.1016/j.drugalcdep.2007.02.006

Table 1.

Means (standard deviations) and prevalences (number) of sample characteristics measured in first grade. Data are from the Baltimore Prevention Research Center at Johns Hopkins University, 1993.

Characteristic 1st Grade (N=488)
Gender
  Male 53.1% (259)
  Female 46.9% (229)
Free/Reduced Lunch
  No 28.3% (138)
  Yes 71.7% (350)
Intervention Group
  Treatment 68.6% (335)
  Control 31.4% (153)
Aggressive/Disruptive Behavior1 1.62 (0.83)
1

Based on teacher-rated reports for youth in the Fall of first grade where 1 =almost never, 2=rarely, 3=sometimes, 4=often, 5=very often, 6=always