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. Author manuscript; available in PMC: 2012 Jul 6.
Published in final edited form as: Subst Use Misuse. 2012 Mar 27;47(6):745–756. doi: 10.3109/10826084.2012.666313

TABLE 1.

Frequency and prevalence distribution of study samples by explanatory variables in 1994–1995

Explanatory variables (n = 7,966) n Prevalence (%)
Gender
    Males 3,679 46.2
    Females 4,287 53.8
Grade
    Grade 6 10 0.1
    Grade 7 1,229 15.4
    Grade 8 1,192 14.0
    Grade 9 1,620 20.3
    Grade 10 1,812 22.7
    Grade 11 1,674 21.0
    Grade 12 380 4.8
Race
    White 3,822 48.0
    Hispanic 1,399 17.6
    Black 1,421 17.8
    Asian 533 6.7
    Native American 79 1.0
    Other 712 8.9
Mean Range
School size (number of students/100) 8.9 Min.: 0.3, Max.: 25.6
Social network variables n Prevalence (%)
Group integration
Outside school friends
    No 4,440 55.7
    Yes 3,526 44.3
Grade heterogeneity group
    Low 2,737 34.4
    Medium 3,392 42.6
    High 1,594 20.0
Prestige
Bonacich centrality
    Low 1,503 18.9
    Medium 5,072 63.7
    High 1,391 17.5
Density
Egocentric density
    Low 708 8.9
    Medium 5,870 73.7
    High 1,145 14.4
Socialization with substance-using peers
Alcohol-using friend
    No 3,730 46.8
    Yes 4,108 51.6