Estimates of Intraclass Correlation Coefficients from Longitudinal Group-Randomized Trials of Adolescent HIV/STI/Pregnancy Prevention Programs

Autor/inn/en	Glassman, Jill R.; Potter, Susan C.; Baumler, Elizabeth R.; Coyle, Karin K.
Titel	Estimates of Intraclass Correlation Coefficients from Longitudinal Group-Randomized Trials of Adolescent HIV/STI/Pregnancy Prevention Programs
Quelle	In: Health Education & Behavior, 42 (2015) 4, S.545-553 (9 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1090-1981
DOI	10.1177/1090198114568308
Schlagwörter	Health Education; Longitudinal Studies; Correlation; Comparative Analysis; Control Groups; Experimental Groups; Acquired Immunodeficiency Syndrome (AIDS); Pregnancy; Prevention; Health Promotion; Program Evaluation; Program Effectiveness; Adolescents; Health Behavior; Risk; Regression (Statistics); Surveys; Service Learning; Sexuality; High School Students; Nontraditional Education; Intervention; Urban Schools; Middle School Students; Gender Differences; Student Characteristics; California; Texas + Suchen Sie Ihr Suchwort? Gesundheitsaufklärung; Gesundheitsbildung; Gesundheitserziehung; Longitudinal study; Longitudinal method; Longitudinal methods; Längsschnittuntersuchung; Korrelation; Schwangerschaft; Prävention; Vorbeugung; Gesundheitsfürsorge; Gesundheitshilfe; Reihenuntersuchung; Programme evaluation; Programmevaluation; Adolescent; Adolescence; Adoleszenz; Jugend; Jugendalter; Jugendlicher; Health behaviour; Gesundheitsverhalten; Risiko; Regression; Regressionsanalyse; Survey; Umfrage; Befragung; Service-Learning; Sexualität; High school; High schools; Student; Students; Oberschule; Schüler; Schülerin; Studentin; Non-traditional education; Alternative Erziehung; Urban area; Urban areas; School; Schools; Stadtregion; Stadt; Schule; Middle school; Middle schools; Mittelschule; Mittelstufenschule; Geschlechterkonflikt; Kalifornien
Abstract	Introduction: Group-randomized trials (GRTs) are one of the most rigorous methods for evaluating the effectiveness of group-based health risk prevention programs. Efficiently designing GRTs with a sample size that is sufficient for meeting the trial's power and precision goals while not wasting resources exceeding them requires estimates of the intraclass correlation coefficient (ICC)--the degree to which outcomes of individuals clustered within groups (e.g., schools) are correlated. ICC estimates vary widely depending on outcome, population, and setting, and small changes in ICCs can have large effects on the sample size needed to estimate intervention effects. This study addresses a gap in the literature by providing estimates of ICCs for adolescent sexual risk-taking outcomes under a range of study conditions. Method: Multilevel regression analyses were applied to existing data from four federally funded GRTs of school-based HIV/STI/pregnancy prevention programs to obtain a variety of ICC estimates. Results: ICCs ranged from 0 to 0.15, with adjustment for covariates and repeated measurements reducing the ICC in the majority of cases. Minimum detectable effect sizes with 80% power and 0.05 significance levels ranged from small to medium Cohen's d (0.13 to 0.53) assuming 20 schools of 100 students each. Conclusions: This study provides the first known set of ICC estimates for investigators to use when planning studies of school-based programs to prevent sexual risk behaviors in youth. The results provide further evidence of the importance of using the appropriate adjusted ICC estimate at the design stage to maximize resources in costly GRTs. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01