title: Intervention completion rates among African Americans in a randomized effectiveness trial for diet and physical activity changes.
abstract: BACKGROUND
  The intervention completion rate is an important metric in behavioral and intervention research; trials with limited intervention completion rates may have reduced internal validity. We examined intervention completion rates among 530 African Americans who had been randomized to an integrated (INT) or disease-specific (DSE) risk education protocol as part of a comparative effectiveness trial from September 2009 to August 2012.
  
  
  METHODS
  The interventions were developed by an academic-community partnership using community-based participatory research. Intervention completion rates were determined based on attendance at all four intervention sessions. Intervention completers were participants who completed all four sessions and noncompleters were those who did not complete any session or only completed one to three sessions following randomization.
  
  
  RESULTS
  Seventy-three percent of participants were intervention completers and 27% were noncompleters. There were no differences in intervention completion based on randomization to INT (72%) or DSE (75%), sociodemographic factors, or body mass index (BMI) in the total sample. Different factors were associated significantly with intervention completion within study groups. Among participants randomized to INT, the odds of intervention completion were greater with higher levels of intrinsic motivation, less exposure to information about diet and cardiovascular disease, and greater BMI. Among participants randomized to DSE, the odds of completing the intervention were associated significantly with older age and greater dietary self-efficacy.
  
  
  CONCLUSIONS
  Many African Americans are likely to complete risk education interventions.
  
  
  CONCLUSIONS
  Psychologic characteristics should be considered when determining intervention completion rates following randomization in behavioral and intervention trials.
authors.affiliation: Authors' Affiliations: Department of Psychiatry and Behavioral Sciences and Hollings Cancer Center; hughesha@musc.edu.
authors.forename: Chanita Hughes
authors.initials: CH
authors.lastname: Halbert
authors.affiliation: Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics;
authors.forename: Scarlett
authors.initials: S
authors.lastname: Bellamy
authors.affiliation: Health Promotion Council of Southeastern Pennsylvania;
authors.forename: Vanessa
authors.initials: V
authors.lastname: Briggs
authors.affiliation: Boonshoft School of Medicine, Wright State University, Dayton, Ohio.
authors.forename: Marjorie
authors.initials: M
authors.lastname: Bowman
authors.affiliation: National Black Leadership Initiative on Cancer, Philadelphia Chapter;
authors.forename: Ernestine
authors.initials: E
authors.lastname: Delmoor
authors.affiliation: Department of Medicine, Division of Geriatric Medicine;
authors.forename: Jerry C
authors.initials: JC
authors.lastname: Johnson
authors.affiliation: Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics;
authors.forename: Shiriki
authors.initials: S
authors.lastname: Kumanyika
authors.affiliation: Department of Public Health Sciences and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina;
authors.forename: Cathy
authors.initials: C
authors.lastname: Melvin
authors.affiliation: Southwest Action Coalition;
authors.forename: Joseph
authors.initials: J
authors.lastname: Purnell
authors.affiliation: Christ of Calvary Community Development Corporation, Philadelphia, Pennsylvania; and.
authors.forename: Rodney
authors.initials: R
authors.lastname: Rogers
authors.affiliation: Department of Family Medicine, University of Pennsylvania;
authors.forename: Benita
authors.initials: B
authors.lastname: Weathers
mesh_terms: D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000368:Aged; D004032:Diet; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009042:Motivation; D010353:Patient Education as Topic / Q000379:methods*; D055815:Young Adult
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