“…Attrition from this combination of voluntary participation and parental permission, along with absenteeism on the day of the survey, reduced the proportion of students who completed the questionnaire to approximately 43% of the total enrollment at the schools sampled (response rates varied among participating schools). This response rate is similar to that reported by other researchers who have adopted the stringent requirements of voluntary participation and parental permission required by both school officials and the institutional review board's policy regarding protected groups in human participants research (Cochran, Wareham, Wood, & Arneklev, 2002;Cochran, Wood, Sellers, Wilkerson, & Chamlin, 1998;Radosevich, Lanza-Kaduce, Akers, & Krohn, 1979). Demographic comparisons of our sample with the general enrollment population of the schools targeted suggest that our sample somewhat underrepresents males (44.4% vs. 48.9%) but that the racial mix is quite proportionate (20.2% Native American and 9.7% Black vs. 22.1% and 9.2%).…”