title: Correction for the design effect in school-based substance use and abuse prevention research: sample size requirements and analysis considerations.
authors: Postgraduate Medicine and Health Professions Education, University of Michigan, Ann Arbor 48109-0201, USA.
authors: T E
authors: TE
authors: Dielman
mesh_terms: D003627:Data Interpretation, Statistical; D006801:Humans; D012107:Research Design; D012494:Sampling Studies; D012574:Schools; D019966:Substance-Related Disorders / Q000517:prevention & control*