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Community engagement in patient-centered outcomes research: Benefits, barriers, and measurement

Published online by Cambridge University Press:  14 May 2019

Linda Sprague Martinez*
Affiliation:
Boston University School of Social Work, Boston, MA, USA
Kelsi Carolan
Affiliation:
Boston University School of Social Work, Boston, MA, USA
Arden O’Donnell
Affiliation:
Boston University School of Social Work, Boston, MA, USA
Yareliz Diaz
Affiliation:
Center for Community Health Education Research and Service, Inc., Boston, MA, USA
Elmer R. Freeman
Affiliation:
Center for Community Health Education Research and Service, Inc., Boston, MA, USA
*
*Address for correspondence: L. Sprague Martinez, PhD, Boston University School of Social Work, 264 Bay State Road, Boston MA 02215, USA. Email: [email protected]
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Abstract

Introduction:

This study employed the Delphi method, an exploratory method used for group consensus building, to determine the benefits and challenges associated with community engagement in patient-centered outcomes research.

Methods:

A series of email surveys were sent to the Patient-Centered Outcomes Research Institute (PCORI)-funded researchers (n = 103) in New England. Consensus was achieved through gathering themes and engaging participants in ranking their level of agreement over three rounds. In round one, participant responses were coded thematically and then tallied. In round two participants were asked to state their level of agreement with each of the themes using a Likert scale. Finally, in round three, the group was asked to rank the round two themes based on potential impact.

Results:

Results suggested the greatest benefit of community engagement is that it brings multiple perspectives to the table, with 92% ranking it as the first or second most important contribution. Time was ranked as the most significant barrier to engaging community. Strategies to overcome barriers to community engagement include engaging key stakeholders early in the research, being kind and respectful and spending time with stakeholders. The most significant finding was that no researchers reported having specific measures to evaluate community engagement.

Conclusion:

Community engagement can enhance both research relevance and methodology when researchers are engaged in meaningful collaborations. Advancing the science of community engagement will require the development of evaluation metrics to examine the multiple domains of partnership.

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Association for Clinical and Translational Science 2019

Introduction

The Patient-Centered Outcomes Research Institute (PCORI) was created through the Patient Protection and Affordable Care Act with the intention of elevating patient voice in research [Reference Selby, Beal and Frank1]. The PCORI mantra, “research done differently” translates to “funded research that can help patients and those who care for them make better-informed decisions about the healthcare choices they face every day, guided by those who will use that information” in the provision of their care [2]. Engagement can help ensure research is culturally relevant and aligned with community priorities and can help to sustain engagement and interest among those most impacted [Reference Cargo and Mercer3]. In addition, it can promote resource sharing and co-learning between community partners and researchers, increasing their capacity [Reference Strand, Cutworth and Stoecker4]. Importantly, such approaches can facilitate the translation of research into policy and practice [Reference Wallerstein and Duran5].

There are well-documented challenges associated with engaging communities (both residents and organizations) in research. Differences in priorities as well as a lack of transparency can lead to disagreements between researchers and community partners [Reference Butterfoss6]. Communication barriers can emerge as the result of disciplinary jargon and exclusionary language on the part of the researchers [Reference Martinez, Russell and Rubin7]. Power dynamics between researchers and partners, in this case patients and providers, can complicate interactions and impede the development of trusting relationships [Reference Uyeda, Bogart and Hawes-Dawson8]. Real barriers exist between researchers and community partners, particularly in communities of color, which have been historically exploited by academic researchers and the medical community. These barriers may accumulate to render relationship development time-intensive work [Reference Cole, Edelman and Boshnack9, Reference Lucero and Wallerstein10].

Similarly to our previous work exploring community engagement in the Clinical Translational Science Award (CTSA) program, to inform testimony to the Institute of Medicine [Reference Freeman, Seifer and Stupak11], we employed the Delphi Method (Delphi) to determine the benefits and challenges associated with community engagement in patient-centered outcomes research (PCOR). In this instance we defined community as patients and those who work with them in the broader community. The Delphi method, specifically, was designed to be an exploratory consensus-building tool [Reference Crisp, Pelletier and Duffield12]. It is used by researchers and practitioners from diverse disciplinary backgrounds and is particularly useful in situations in which face-to-face meetings are not possible. Delphi was a tool for soliciting the opinions of PCORI-funded researchers across New England to garner a sense of the barriers and facilitators associated with engagement in the context of PCOR.

This paper describes the Delphi process employed. The overall results are then discussed in the context of the literature. The study confirms previous findings related to the barriers to and benefits associated with community engagement in health research more broadly. Perhaps the most salient finding is the lack of emphasis that is being placed on the measurement and evaluation of community engagement in PCOR research.

Methods

The Delphi method is an iterative process, requiring participants to engage with questions asked of them over time, through the use of consecutive surveys [Reference Crisp, Pelletier and Duffield12]. One of the key elements of the Delphi process is that in the second and third rounds, participants have the benefit of (1) seeing the input from all the other participants in the process and (2) having the group inform their personal input [Reference Crisp, Pelletier and Duffield12]. Participants are able to reflect on the topic at hand and incorporate the group’s knowledge, which results in a consensus in which every voice is heard.

Utilizing a list of PCORI-funded researchers obtained from the PCORI website, we identified the contact information for each principal investigator on the list of PCORI awardees. An electronic survey explaining the goal and objective of the Delphi was then sent to awardees (N = 103). Survey questions used to evaluate community engagement in the CTSA program were adapted by our PCORI Community Advisory Board. A total of three rounds were conducted by email survey, each time allowing participants 14 days to respond. All rounds were sent to the original recipients regardless of whether they responded in previous rounds. In each round, the respondent was asked to identify their state, gender, educational background, and role on the PCORI project: (1) Principal Investigator, (2) Project Lead, (3) Project Coordinator, (4) Research Assistant, (5) Community Stakeholder, or (6) a specific other.

The first round of the survey consisted of six open-ended questions exploring participant perceptions of community engagement in PCOR. More specifically, the questions examined: the role of community stakeholders in PCOR; how institutional and community politics impact community engagement; barriers to community engagement; strategies for overcoming engagement barriers; and methods for evaluating community engagement in PCOR. Reports were generated using Qualtrics. Open-ended responses were reviewed by two researchers, who thematically coded participant responses by question. Researchers then met to review and reconcile the themes, assuring the reliability of results. Round one themes were listed as responses for each of the six original items. Participants were asked to rate their level of agreement on a Likert scale ranging from disagree strongly to agree strongly. The third and final round included all of the responses from round two, and asked participants to rank the responses in order of importance.

Results

Round One

A total of 47 individuals participated in the first round of the Delphi, with the majority of participants representing projects based in Massachusetts (n = 36). The remaining participants were from Connecticut (7), Vermont (2), New Hampshire (1), and Maine (1). We anticipated this would be the case, given that 76.7% of the sample was based in Massachusetts. All but one participant in the first round identified as a principal investigator or project lead. The remaining individual identified as a research assistant. The gender split was fairly even, with 24 females and 21 males.

Participants were asked to describe the benefits of engaging community. It was reported that engagement increases researcher accountability to the community. Moreover, community engagement was seen as a process that ultimately enhances the research by bringing multiple perspectives to the table and improving the research’s relevance, as well as credibility, by ensuring alignment between researcher and community goals. There was agreement across participant responses that community engagement may increase both researcher and community capacity. Finally, participants reported engagement reduces inequitable power dynamics between researchers and stakeholders. A sample of illustrative quotes can be seen in Table 1.

Table 1. The benefits of stakeholder engagement

Participants were asked to share the ways in which politics – institutional, community, or otherwise – impact community engagement. This question proved problematic. Some reported it was unclear, while others described it as a “loaded” question. Those who responded implicated institutional racism as a central way in which politics impacts community engagement. Additional themes that emerged in response to this question included: conflicting interests, bureaucracy, time, funding, lack of trust, and community politics. The stigma associated with particular health areas (such as mental health and substance use disorders) impacts community engagement. Examples of themes can be seen in Table 2.

Table 2. Politics that impact engagement

Additional barriers to community engagement described by participants included: time, staffing limitations, funding, bureaucracy, the challenges of educating partners, and insufficient engagement expectations or superficial engagement, in which partners are tokenized. In addition, the prevalence of jargon and technical language in research was seen as creating communication barriers between researchers and community partners. Limited English proficiency was also seen as a barrier, along with deep-seated community mistrust and fear of exploitation. Finally, participants described the difficulty of identifying and engaging patients of color as a barrier.

Recommendations for addressing the barriers to community engagement included increasing communication, spending time getting to know community partners, and developing structures for shared decision-making and shared goal setting. Participants recommended engaging community early and across all phases of the research, taking steps to ensure equitable funding and compensation, and increasing investigator education related to best practices for collaborating with communities. Participants specifically indicated transparency and flexibility on the part of the researcher, as well as being kind, genuine, and respectful to partners were strategies for overcoming engagement barriers. Finally, participants were invited to describe how they are evaluating community engagement, including the use of metrics. No metrics were identified, although some participants reported working on measure development. Evaluative methods reported include: qualitative interviews, process measures and anonymous surveys, as well as tracking participation.

Round Two

Round two had a total of 34 responses. As was the case with round one, the majority of respondents (n = 24) were from Massachusetts. Twenty-nine participants were principal investigators or project leads and two were project coordinators; those remaining were community partners (n = 3). In round two, there were slightly more women than men (n = 20 and n = 14, respectively). The majority of the participants agreed or strongly agreed with the themes identified regarding benefits of engaging community stakeholders. The greatest agreement was with the statement: community engagement brings multiple perspectives to the table, which enhances the research. The vast majority of participants were in agreement that engagement increases researcher accountability to community, improves the appropriateness of the research and lends credibility to the research. Finally, a majority agreed community engagement increases the capacity of the research team. The least amount of strong agreement was with the statement community engagement reduces inequitable power dynamics. A summary of responses can be found in Table 3.

Table 3. The benefits of engagement

As indicated in Table 4, agreement with the factors impacting stakeholder engagement identified in round one was not unanimous, with the exceptions of time, bureaucracy, and the distribution of funding and compensation. Responses were mixed regarding the extent to which participants agreed on the impact of institutional racism, institutional hierarchy, conflicting interests, and stigma. Most participants disagreed that resistance to outcomes research impacts stakeholder engagement. All participants agreed that time is a barrier to engagement, as are staffing limitations, funding, engaging patients of color, and inconsistent engagement expectations or superficial engagement. Most participants agreed that communication barriers existed due to jargon and technical language. A smaller majority of participants agreed limited English proficiency is a barrier, as well as stakeholder mistrust and educating stakeholders.

Table 4. Factors impacting engagement

Overall, participants agreed with the strategies identified in round one for overcoming engagement barriers. The strongest level of agreement was indicated for the following strategies: engage stakeholders early and across all phases of the research (75% strongly agreed and 18.75% somewhat agreed); be kind, genuine, and respectful (75% strongly agreed and 18.75% somewhat agreed); and spend time getting to know community stakeholders (71.88% strongly agreed and 21.88% somewhat agree). Participant responses also indicated fairly high agreement that developing structures for shared decision-making and shared goal setting, as well as assuring equitable funding and compensation are effective strategies for overcoming engagement barriers.

Finally, participants agreed with the identified strategies for evaluating community engagement, with the majority indicating that they strongly or somewhat agree that qualitative interviews (96.88% agreement), anonymous surveys (90.63), and tracking participation (81.26%) are effective measures. Process measures yielded the lowest level of agreement, with more than three quarters of participants strongly or somewhat agreeing that process measures are an effective strategy for evaluating community engagement.

Round Three

There were 36 participants in round three. As was the case with rounds one and two, the majority of respondents were in Massachusetts (25). Thirty of the 36 participants identified as a principal investigator or project lead; the remaining participants identified as community engagement, patient co-investigators, and patient research partners. More women than men responded (23 and 11, respectively). One participant identified as other and one did not complete the gender item. Participants were asked to rank items identified in rounds one and two in terms of their relative importance. Participants indicated bringing multiple perspectives to the table which enhances research is the greatest potential benefit associated with community engagement, with 65.52% of participants ranking this item first and 27.59% of participants ranking it second. The largest proportion of participants ranked improves the appropriateness of the research as offering the second most potential benefit, although agreement was lower, with 20.69% ranking this item first, and 31.03% ranking it second. The statement that engaging community stakeholders as a potential benefit by lending credibility to the research was ranked the lowest.

Participants were asked to rank items identified in rounds one and two as impacting community engagement in order of most to least impactful. Time was considered to have the greatest impact, with 48.28% of respondents ranking it first. Bureaucracy was also considered highly impactful, with 13.79% of participants ranking it first and 27.59% ranking it second. Stigma and institutional racism were ranked as least impactful. Participants were also asked to rank which items identified in the first rounds presented the greatest barrier to community engagement. Time was again considered the greatest barrier to engagement, with the largest portion of participants ranking it first compared to other items (42.86). Nearly 18% (17.86) of participants ranked funding as the greatest barrier, and 17.86% of participants designated staffing limitations as the second greatest barrier (the highest level of agreement regarding the second greatest barrier after time, which was ranked by 28.57% as the second greatest barrier). Results indicated less concern about barriers associated with limited English proficiency, mistrust, and fear of exploitation, with these items consistently ranking low across participants.

With respect to strategies for overcoming engagement, there was not a great degree of consensus among the group as to which strategies might be most effective. Twenty-five percent of participants ranked increase communications with community first, 21.43% ranked spending time getting to know community stakeholders first, and 25% ranked being kind, genuine, and respectful as first, the most effective strategy for overcoming engagement barriers. Interestingly, although there was agreement in round two about the importance of being kind, genuine, and respectful – and 25% ranked this item first – a quarter of respondents also considered it to be the least effective strategy for overcoming engagement barriers. The majority of participants (71.43%) felt that increasing investigator education would be the least effective strategy.

Finally, participants ranked qualitative interviews as the most effective strategy for evaluating community engagement among the response options, with 68% of participants ranking this item first. Process measures, tracking participation, and anonymous surveys were ranked lower, with 40% of participants ranking tracking participation second, 48% ranking process measures third, and 44% ranking anonymous surveys as the least effective strategy.

Discussion

Participants reached a high level of consensus regarding the greatest potential benefit offered by community engagement in research: that doing so brings multiple perspectives to the table, which ultimately enhances the research. This finding aligns with the extant literature examining researchers’ perspectives on the benefits of PCOR. Researchers interested in engaging patients in the research process may be most motivated by the desire to gain improved understanding of patients’ unique perspectives on and experience with a disease [Reference Forsythe, Ellis and Edmundson13]. Selby et al. [Reference Selby, Forsythe and Sox14] discuss findings from surveys of PCORI-funded researchers indicating community engagement has enhanced the research process in tangible ways. More specifically, engagement has aided in identifying research questions, appropriate study designs, interventions and outcomes most relevant to patients, in addition to enhancing both recruitment and retention.

Participants also agreed that community engagement benefits the research process by improving the overall relevance of the research. These findings echo existing literature indicating community engagement in the context of PCOR is widely considered to improve the relevance of research [Reference Carman and Workman15Reference Concannon, Fuster and Saunders17]. Engagement orients the research toward the questions and concerns most valuable to patients and other stakeholders [Reference Selby, Forsythe and Sox14, Reference Woolf, Zimmerman and Haley16]. Thus, community engagement may result in research that is more meaningful, from the questions selected to the outcomes examined [Reference Forsythe, Ellis and Edmundson13, Reference Selby, Forsythe and Sox14, Reference Woolf, Zimmerman and Haley16].

Consistent with the extant literature, time was identified as the most significant barrier to community engagement. In a survey of PCORI-funded researchers, Forsythe et al. [Reference Forsythe, Ellis and Edmundson13] found researchers considered lack of time – on the part of both researchers and community partners – one of the most significant barriers to community engagement in research. Selby et al. [Reference Selby, Forsythe and Sox14] report researchers applying for PCORI funding have indicated that establishing relationships with community partners, including patients, within the time restrictions of submitting a grant proposal can present a challenge. In addition to time, Forsythe et al. [Reference Forsythe, Ellis and Edmundson13] found staffing limitations in the form of limited research team resources and training to be significant barriers to community engagement.

Participants in the present study pointed to bureaucracy as impacting community engagement, in addition to funding and staffing limitations. Carman and Workman [Reference Carman and Workman15] discuss how the long-standing privileging of health professionals’ perspectives has led to institutional environments with multiple systemic barriers to partnering with community partners. Considerable restructuring and challenging of existing power dynamics has had to occur in order to open pathways for community engagement, and additional infrastructure is needed.

Although findings indicated less agreement with regard to how to best overcome these barriers to stakeholder engagement, the results did point toward increased communication with community stakeholders and spending time getting to know stakeholders as potentially important strategies. Communication strategies are generally considered central to addressing the challenges of engaging community in the research process [Reference Forsythe, Ellis and Edmundson13, Reference Carman and Workman15]. Carman and Workman [Reference Carman and Workman15] describe clear communication as key to adequately preparing partners to engage in the research process. Researchers leading PCORI-funded projects have highlighted specific communication strategies as essential to overcoming certain barriers and improving the engagement process, including ensuring partners have the opportunity to ask questions, making an effort to stay consistently in contact with them, meeting in person, avoiding technical or medical jargon, and ensuring that opportunities for socializing are allowed to take place [Reference Forsythe, Ellis and Edmundson13]. This last strategy closely reflects this study’s finding that spending time getting to know community partners is important.

Perhaps the most salient finding was that among PCOR investigators and partners we engaged in the Delphi, none reported having specific measures to evaluate community engagement. Although, some reported working on developing metrics, most described using qualitative interviews, process measures, tracking participation, and anonymous surveys. One challenge for PCORI researchers will be to avoid what Goodman and Thompson [Reference Goodman and Thompson18] term “symbolic participation,” where partners are allowed to hear plans and have a voice, but those voices do not carry the weight of influence. Advancing the science of community engagement in PCOR will require systematic evaluation and the development of metrics which assess a variety of domains such as levels of collaboration, co-learning, trust between community partners and researchers, and shared decision-making authority. Although successful engagement in a single project is admirable, PCORI researchers will benefit from drawing on the lessons and best practices of community-based participatory researchers as they work to develop new metrics.

Although institutional racism, hierarchy, and stigma came up as barriers in round one, they were not prioritized in later rounds. This finding was inconsistent with the literature which points to systems of oppression, particularly racism, as impacting community engagement. It may be that those who raised the concern in the first round did not participate in subsequent rounds, which is a limitation of the Delphi method. It may have also been the makeup of our sample. Although we encouraged participants to share the survey link with their partners, community participation was minimal at best. As such, the results presented represent the views of principal investigators and project leads for the most part, who are researchers in academic medical settings. The views of community partners are likely to be different from those of researchers. An additional limitation to this work was the fairly response rates low in each round and not all participants completed all of the items. We have included the number of responses in addition to the percent of respondents in the tables to provide a more accurate picture for the reader. Despite limitations, these data provide an important starting point for understanding the perceived benefits and barriers to community engagement in PCOR. More importantly it highlights the need for metrics to better understand community engagement in PCOR.

Conclusions

The challenges to community engagement identified by PCORI-funded researchers in our sample are consistent with the literature on engagement in PCOR. Findings are also well aligned with the challenges experienced by community engagement researchers in the CTSA program. Community engagement can enhance the both the research relevance and the methodology. This can only happen when researchers are engaged in meaningful collaborations with stakeholders which calls for intentionality and takes time. Advancing the science of community engagement in PCOR will require systematic evaluation and the development of metrics to examine the multiple domains of partnership. There is a need for increased research infrastructure in the community; in addition, academic research institutions will need to restructure to facilitate genuine engagement and participation.

Acknowledgements

The authors acknowledge the current and former advisory board members of the Boston BRI…DGE for their participation, suggestions, and comments throughout the process: Ms. Alexis Snyder, Dr. Jonathan Jackson, Ms. April Holley, Ms. Diane Rogers, Mr. Khalil Saddiq, Ms. Dita Obler, and Ms. Chien-Chi Huang.

Financial Support

This research was funded by the Patient-Centered Outcomes Research Institute. Project Number: 3507-CCHERS PCORI (Freeman and Sprague Martinez).

Disclosures

The authors have no conflicts to disclose.

References

Selby, JV, Beal, AC, Frank, L. The Patient-Centered Outcomes Research Institute (PCORI) national priorities for research and initial research agenda. JAMA 2012; 307(15): 15831584.Google ScholarPubMed
Patient-centered outcomes research institute. About Us: Research done differently. Retrieved from https://www.pcori.org/about-us. Accessed June 26, 2017.Google Scholar
Cargo, M, Mercer, SL. The value and challenges of participatory research: Strengthening its practice. Annual Review of Public Health 2008; 29(1): 325350.CrossRefGoogle ScholarPubMed
Strand, KJ, Cutworth, N, Stoecker, R, et al. Community-based Research and Higher Education: Principles and Practices. San Francisco, CA: Jossey-Bass; 2003.Google Scholar
Wallerstein, N, Duran, B. Using community-based participatory research to address health disparities. Health Promotion and Practice 2006; 7(3): 312323.CrossRefGoogle ScholarPubMed
Butterfoss, FD. Coalitions and Partnerships in Community Health. San Francisco, CA: Jossey-Bass; 2007.Google Scholar
Martinez, LS, Russell, B, Rubin, CL, et al. Clinical and translational research and community engagement: Implications for researcher capacity building. Clinical and Translational Science 2012; 5(4): 329332.CrossRefGoogle Scholar
Uyeda, K, Bogart, LM, Hawes-Dawson, J, et al. Development and implementation of a school-based obesity prevention intervention: Lessons learned from community-based participatory research. Progress in Community Health Partnerships: Research, Education, and Action 2009; 3(3): 249255.CrossRefGoogle ScholarPubMed
Cole, CA, Edelman, EJ, Boshnack, N, et al. Time, dual roles, and departments of public health: Lessons learned in CBPR by an AIDS service organization. Progress in Community Health Partnerships: Research, Education, and Action 2013; 7(3): 323330.CrossRefGoogle ScholarPubMed
Lucero, J, Wallerstein, N. Trust in community, academic research partnerships: Increasing the consciousness of conflict and trust development. In: Sage Handbook of Conflict Communication: Integrating Theory, Research, and Practice. John G. Oetzel and Stella Ting-Toomey, 537–562 (Ch. 20), 2nd ed. Thousand Oaks, CA: Sage; 2013.Google Scholar
Freeman, E, Seifer, SD, Stupak, M, et al. Community engagement in the CTSA program: Stakeholder responses from a national Delphi process. Clinical and Translational Science 2014; 7(3), 191195.CrossRefGoogle Scholar
Crisp, J, Pelletier, D, Duffield, C, et al. The Delphi method? Nursing Research 1997; 46(2), 116118.CrossRefGoogle ScholarPubMed
Forsythe, LP, Ellis, LE, Edmundson, L, et al. Patient and stakeholder engagement in the PCORI pilot projects: Description and lessons learned. Journal of General Internal Medicine 2016; 31(1): 1321.CrossRefGoogle ScholarPubMed
Selby, JV, Forsythe, L, Sox, HC. Stakeholder-driven comparative effectiveness research: An update from PCORI. JAMA 2015; 314(21): 22352236.CrossRefGoogle ScholarPubMed
Carman, KL, Workman, TA. Engaging patients and consumers in research evidence: Applying the conceptual model of patient and family engagement. Patient Education and Counseling 2017; 100(1): 2529.CrossRefGoogle ScholarPubMed
Woolf, SH, Zimmerman, E, Haley, A, et al. Authentic engagement of patients and communities can transform research, practice, and policy. Health Affairs 2016; 35(4): 590594.CrossRefGoogle ScholarPubMed
Concannon, TW, Fuster, M, Saunders, T, et al. A systematic review of stakeholder engagement in comparative effectiveness and patient-centered outcomes research. Journal of General Internal Medicine 2014; 29(12): 16921701.CrossRefGoogle ScholarPubMed
Goodman, MS, Thompson, VLS. The science of stakeholder engagement in research: Classification, implementation, and evaluation. Translational Behavioral Medicine 2017; 7(3): 486491.CrossRefGoogle ScholarPubMed
Figure 0

Table 1. The benefits of stakeholder engagement

Figure 1

Table 2. Politics that impact engagement

Figure 2

Table 3. The benefits of engagement

Figure 3

Table 4. Factors impacting engagement