title: The Navigation Guide systematic review methodology: a rigorous and transparent method for translating environmental health science into better health outcomes.
abstract: BACKGROUND
  Synthesizing what is known about the environmental drivers of health is instrumental to taking prevention-oriented action. Methods of research synthesis commonly used in environmental health lag behind systematic review methods developed in the clinical sciences over the past 20 years.
  
  
  OBJECTIVE
  We sought to develop a proof of concept of the "Navigation Guide," a systematic and transparent method of research synthesis in environmental health.
  
  
  CONCLUSIONS
  The Navigation Guide methodology builds on best practices in research synthesis in evidence-based medicine and environmental health. Key points of departure from current methods of expert-based narrative review prevalent in environmental health include a prespecified protocol, standardized and transparent documentation including expert judgment, a comprehensive search strategy, assessment of "risk of bias," and separation of the science from values and preferences. Key points of departure from evidence-based medicine include assigning a "moderate" quality rating to human observational studies and combining diverse evidence streams.
  
  
  CONCLUSIONS
  The Navigation Guide methodology is a systematic and rigorous approach to research synthesis that has been developed to reduce bias and maximize transparency in the evaluation of environmental health information. Although novel aspects of the method will require further development and validation, our findings demonstrated that improved methods of research synthesis under development at the National Toxicology Program and under consideration by the U.S. Environmental Protection Agency are fully achievable. The institutionalization of robust methods of systematic and transparent review would provide a concrete mechanism for linking science to timely action to prevent harm.
authors: Program on Reproductive Health and the Environment, University of California, San Francisco, Oakland, California, USA.
authors: Tracey J
authors: TJ
authors: Woodruff
authors: Patrice
authors: P
authors: Sutton
mesh_terms: D015982:Bias; D003661:Decision Support Techniques; D004782:Environmental Health / Q000379:methods*; D015386:Hazardous Substances / Q000633:toxicity; D006801:Humans; D033183:Interdisciplinary Communication; D012196:Review Literature as Topic
chemical_list: D015386:Hazardous Substances