Strategies to facilitate the report-back of research results: a systematic review of methods and evaluations

Reporting back of research results (RBRR) is becoming a recognized component of ethical community-engaged and human subjects research. Scholars emphasize the importance of involving participants in developing reports and methods of report-back, arguing that RBRR enhances comprehension, trust, and engagement with findings. Yet, despite growing recognition, standardized guidelines for ethical RBRR remain limited. To address this gap, we conducted a systematic literature review of peer-reviewed studies- primarily in genomics, environmental health, and biomonitoring- to identify RBRR development strategies. Secondarily, we assessed how these strategies may align with the bioethical principles of autonomy, beneficence, nonmaleficence, and justice to inform future RBRR design. A systematic search of Web of Science, PubMed, and Google Scholar yielded 2,164 records; after removing 748 duplicates, 1,416 unique studies were screened, and 32 met the inclusion criteria (peer-reviewed, published 2016–2024, written in English). Studies were required to include primary report-back (e.g., direct return of results to participants) or detailed descriptions of RBRR methods or recommendations. The review followed a PE/IO (Population, Exposure, Intervention, Outcome) framework and adhered to PRISMA guidelines. Risk of bias was assessed using the STROBE cohort study checklist and GRADE criteria. Across studies, RBRR was framed as an ethical obligation, and an opportunity to improve understanding of environmental influences on health. Most emphasized plain-language communication (n = 8), multimodal dissemination (n = 10), and culturally responsive design (n = 4). However, only three studies applied formal communication or evaluation frameworks, and only one-third described how materials were developed. Common evaluation methods included post-report surveys (n = 22), interviews (n = 18), and focus groups (n = 14), however, we noted a lack of consistency in evaluation methods. Collectively, these 32 studies underscored the importance of tailoring materials to population characteristics, providing multiple formats, and experimenting with visual and digital tools to enhance comprehension. Although none cited a bioethical framework, the core principles were reflected in practice: respect for autonomy through participants’ right to know their results; beneficence through the development of accessible, actionable materials; nonmaleficence through anticipating and mitigating anxiety or confusion; and justice through culturally and linguistically appropriate design. Yet, gaps remain, with inconsistent characterization of RBRR methods and limited evaluation of RBRR. This study was limited by the risk of bias in participant selection, as many studies included participants with prior interest in the field of environmental health or emotional investment in the studies. Ethical RBRR supports both individual and collective knowledge and action when paired with ongoing community engagement. Developing consistent, evidence-based best practices that balance feasibility with contextual relevance could strengthen trust, comprehension, and the translation of scientific findings into meaningful public-health action.