Final Research Report

View this project's final research report.

Peer-Review Summary

Peer review of PCORI-funded research helps make sure the report presents complete, balanced, and useful information about the research. It also confirms that the research has followed PCORI’s Methodology Standards. During peer review, experts who were not members of the research team read a draft report of the research. These experts may include a scientist focused on the research topic, a specialist in research methods, a patient or caregiver, and a healthcare professional. Reviewers do not have conflicts of interest with the study.

The peer reviewers point out where the draft report may need revision. For example, they may suggest ways to improve how the research team analyzed its results or reported its conclusions. Learn more about PCORI’s peer-review process here.

In response to peer review, the PI made changes including

  • Justifying the inclusion of a large number of measures in the study to evaluate study outcomes by citing the lack of “gold standard” measures for individuals with serious mental illness. The investigators further explained inconsistencies between the outcomes reported in the final report and those listed in their record
  • Completing sensitivity analyses comparing study outcomes with and without imputing values for missing data. The investigators initially justified the lack of imputation, despite the high attrition rate, by stating that their final sample size still met power estimates. The results from imputing study outcomes did not differ from the originally reported analyses
  • Explaining the rationale for comparing the 6-month scores for the waitlist control group to the 6-month scores for the intervention group. The reviewers were concerned that the 6-month scores for the waitlist group might be contaminated with information about the intervention, so the researchers also compared the waitlist baseline scores with the 6-month intervention scores, and reported the differences in a footnote

Conflict of Interest Disclosures

Project Information

John Sinclair Brekke, PhD, MS
University of Southern California
Peer Health Navigation: Reducing Disparities in Health Outcomes for the Seriously Mentally Ill

Key Dates

September 2013
December 2017

Study Registration Information


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Health Conditions Health Conditions These are the broad terms we use to categorize our funded research studies; specific diseases or conditions are included within the appropriate larger category. Note: not all of our funded projects focus on a single disease or condition; some touch on multiple diseases or conditions, research methods, or broader health system interventions. Such projects won’t be listed by a primary disease/condition and so won’t appear if you use this filter tool to find them. View Glossary
Populations Populations PCORI is interested in research that seeks to better understand how different clinical and health system options work for different people. These populations are frequently studied in our portfolio or identified as being of interest by our stakeholders. View Glossary
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Intervention Strategy Intervention Strategies PCORI funds comparative clinical effectiveness research (CER) studies that compare two or more options or approaches to health care, or that compare different ways of delivering or receiving care. View Glossary
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Last updated: March 4, 2022