title: Theoretical issues in the synthesis of HIV prevention research.
abstract: The evidence base for science and health policy consists of many independent research studies. Combining evidence from multiple studies that differ in important ways presents challenges that have been addressed in other areas of scientific research and are now beginning to be addressed in HIV prevention research. Syntheses can enhance statistical power and produce summary evidence that is more generalizable than individual primary research.
authors.affiliation: Department of Education, and the Harris Graduate School of Public Policy Studies, University of Chicago, Illinois 60637, USA.
authors.forename: Larry V
authors.initials: LV
authors.lastname: Hedges
authors.forename: Wayne D
authors.initials: WD
authors.lastname: Johnson
authors.forename: Salaam
authors.initials: S
authors.lastname: Semaan
authors.forename: Ellen
authors.initials: E
authors.lastname: Sogolow
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control*; D003625:Data Collection; D015340:Epidemiologic Research Design; D006801:Humans; D017063:Outcome Assessment, Health Care; D011634:Public Health / Q000379:methods