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. Author manuscript; available in PMC: 2009 Sep 17.
Published in final edited form as: Drug Alcohol Depend. 2009 Feb 27;102(1-3):78–87. doi: 10.1016/j.drugalcdep.2009.01.012

Table 1.

Sample characteristics.

Racial distribution Age distribution by gender (N)
Racial category N % Wave 1 Wave 2
Age Females Males Age Females Males
Caucasian 1538 88.75 12 189 157 17 246 234
Mixed ethnicity 117 6.75 13 154 157 18 76 61
Unknown 32 1.85 14 107 119 19 103 128
Asian 21 1.21 15 115 99 20 102 91
African American 14 0.81 16 103 86 21 128 81
Native American 8 0.46 17 113 94 22 101 108
Pacific Islander 3 0.17 18 133 107 23+ 158 116
Totals 1733 100 914 819 914 819