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Table 1 Variables included in constrained randomization

From: Study protocol for a cluster randomized trial of a school, family, and community intervention for preventing drug misuse among older adolescents in the Cherokee Nation

Characteristic Balance for constrained randomization Source
High school  
 % American Indian Within 5 percentage points National Center for Education Statistics [27]
 Absenteeism rate Within 5 percentage points Oklahoma School Report Cards [28]
 % Free/reduced price lunch Within 5 percentage points National Center for Education Statistics [27]
 Rate of substance use incidents per 100 students Within 0.5 incidents per 100 students Oklahoma Department of Education Annual Incident and Suspension Report [29]
 Four-year graduation rate Within 5 percentage points Oklahoma School Report Cards [28]
 Class size Within 5 students or 10% National Center for Education Statistics [27]
Community  
 Medical marijuana dispensary No more than 1 discrepant community across conditions OMMA Dispensary List [30]
 City police No more than 1 discrepant community across condition Google search
 Mental health counselors Mean number per condition within 1 OK State Board of Behavioral Health-LPC License Search [31]