Contributions by patient partners

This rapid review was conducted with a group of patients and relatives (PRs) (AKS, KB, KEB and TA), each of them are / have been a patient or carer to a patient in Denmark. Table 1 and Additional file 1: Appendix D have been developed by AKS and AWK. AKS has been part of the development of study objectives, protocol, and discussions on synthesis strategy. She has read 11 articles [1,2,3,4,5,6,7,8,9,10,11]; she used those to populate the tables as well as provide analytical reflections. Patient partners KB, KEB and TA read 3 Danish articles [6,7,8] and provided analytical reflections on these. AWK developed an open question matrix to support their work with the articles. All patient partners actively contributed to the development of the column “Patient partner observations” and brought insights to the analysis and discussion below (If the reader is interested in more information on our collaborative processes, see Additional file 1: Appendix B for a GRIPP2 short form and overview of our involvement roles using the Involvement Matrix).

Table 1 Overview of included articles
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Background

In the last decades, involving patients in developing and conducting health research projects has become a way of achieving high quality and efficient integration of health care [71] as well as improving the overall quality of health research [72]. When PRs are involved not as research subjects but as research partners in the health research process, it can lead to: “meaningful change in patient outcomes and health systems, and realigning both research processes and outcomes to be patient-centered” [73]. PR involvement has become a demand for many funding programmes and journals as well as a health policy prioritisation [74]. Despite increasing numbers of projects involving PRs, studies have highlighted unclear definitions of involvement and describe tensions when trying to validate experience-based knowledge in the medical field [75].

Many different labels exist to describe involvement processes: co-production, co-design, collaboration, involvement, engagement, patient and public involvement, community based participatory research, participatory action research and others in research reports. These concepts and methods are rooted in traditions of different research disciplines and contexts [76], but whether the involvement method or label used to describe this, has implications on the partnerships and outcomes is unclear [77]. Recent literature has looked at partnership practices and found that: role definition and partner expectations are necessary prerequisites for the partnership to be successful. Respect, equitable power, trust, transparency, shared and collaborative decision making has been described as foundational principles for research partnerships; and patients taking on different roles during research partnerships, such as: members of research teams, advisory groups, steering committees and working groups, consultation, and specific research tasks [73, 74, 78]. These authors recommended further detailed analysis of partnership role characteristics and what impact they have. Others concluded that we lack knowledge on how impact and outcomes are achieved in these collaborative partnerships [79] and how these partnerships might be similar or different [80]. It should be noted that the role of the researchers in research partnerships has been investigated much less than the role of patients [81].

Objectives of this study

We studied peer-reviewed articles describing PPIE activities for the roles researchers and PRs fulfil in different types of involvement activities, the factors that enable involvement, and how PRs’ knowledge is utilised. As part of that:

  • How do patients and relatives establish themselves as knowledgeable?

  • What roles do researchers, patients, and relatives have in enabling partnerships?

The term Patient and Public Involvement/Engagement (PPIE), which has previously been described as internationally representative to cover the wide range of involvement activities and methods [76], will be used in this article.

Methods

This study used a rapid review approach to obtain a systematic overview of articles describing PPIE in health research followed by a narrative analysis and meta synthesis of selected articles. Rapid reviews are a newer form of review and are described as an: “assessment of what is already known about a policy or practice issue, by using systematic review methods to search and critically appraise existing research” [82]. By omitting or simplifying the systematic review process, it has the benefit of providing an overview without requiring substantial resources and time and thereby helps closing the gap between decision making and evidence generation [83]. It has an explorative character and is suited to investigate new trends as it gives an overall quality or direction of the literature available [82].

Our methods were inspired by Haby [83], Dobbins [84] and Boden et al. [85]. As there is no set way of conducting a rapid review, we highlight the steps altered from a systematic review:

  • development of a high specificity search string,

  • limitation of databases to four,

  • no use of grey literature,

  • time limit on publications,

  • main screening performed by the first author,

  • no systematic quality assessment,

  • in-depth analysis limited to a selected group of included articles.

See Additional file 1: Appendix C for a justification of each of these choices. The selection process of included papers follows the PRISMA guidelines [86] (See Fig. 1), and the reporting uses the PRISMA 2020 checklist [86] where items are applicable according to the used rapid review methodology.

Fig. 1
figure 1

PRISMA Flowchart

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In accordance with this study’s overarching principles of accessibility, transparency and reciprocity as basis for research partnerships, the protocol for this rapid review was co-developed and registered with the Open Science Framework on Nov 25th 2021 [87] https://doi.org/10.17605/OSF.IO/QMWVK). Alterations to the protocol can be found in Additional file 1: Appendix C; main changes included only performing narrative and meta analysis on a selection of included article.

Eligibility criteria

Inclusion criteria were: Published articles presenting practical examples and reflections, case studies, interviews, ethnographies, or evaluations of research partnerships between PRs and researchers in any type of qualitative or quantitative studies (see Additional file 1: Appendix C for detailed inclusion and exclusion criteria). The Guidance for Reporting Involvement of Patients and Public (GRIPP) guidelines, a checklist for reporting PPIE activities in health research first published in 2012 [88] (and the in 2017 revised GRIPP 2 [89]) first offered a comparable framework to describe and report involvement practices. Therefore, we excluded papers published prior to 2012. The population was defined as patients of any age with any (past or present) medical condition, relatives or caregivers participating as stakeholders, panellists, co-designers etc. at any point of the research cycle.

Search strategy

Searches were run in four databases (Medline, Embase, PsycInfo and CINAHL) in November 2021 and rerun in February 2022. It has been noted previously how reporting on patient involvement activities varies: sometimes not mentioned in the title or abstract [90] and challenging to capture in (standard) search terms [80]. Therefore, we used the quality-tested patient involvement search string developed by Rogers et al. [90] and Cooke & Smiths’ SPIDER-tool [91] incorporating search blocks on study design and research type for higher specificity. The search string was developed for Medline and translated with the assistance of a research librarian to match the other databases. See Additional file 1: Appendix A for SPIDER-tool (Additional file 1: Table S1) and Medline search string (Additional file 1: Fig. S1).

Data analysis

To provide an overview of study characteristics of included articles as well as an in-depth analysis of roles, enablers and outcomes, the results were synthesized as follows:

  • Overview of study characteristics of all eligible papers reporting on PR/researcher partnerships using a matrix to extract descriptive information.

  • Narrative analysis of partnership roles of selected articles using the Involvement Matrix.

  • Meta-synthesis of PPIE enablers of selected articles.

Study characteristics We conducted a descriptive summary of all 70 papers extracting data on geographical origin of project, research area and design, format of PR group, focus of article, philosophy for inclusion, themes discussed and PR co-authorship. This information was extracted from all parts of the papers; a thorough read and reread for each paper was required. Our goal was to create a searchable overview of relevant practical PPIE examples readily available for interested readers (Table 1). As such, we aimed to deliver towards one of the rapid review’s functions of providing clarity and accessibility of research evidence [83].

Narrative analysis As we found more eligible papers than anticipated we discussed how best to give an overview of available evidence in the timeframe available. We selected 40 papers which we considered most comparable (depicted with an asterisk in Table 1), according to the following rationale:

  • partnerships with adult patients and relatives (as research indicates that extra steps have to be taken to enable participation of children and youth [92]),

  • articles that reported the framework used to account for and or support their involvement activities either in the background or methods section (as we aimed to investigate different types of partnerships, we found it useful to understand the framework behind the PPIE activities),

  • Excluding systematic reviews (as detailed Cochrane guidelines on PR involvement in systematic reviews are available [93] and we considered this a readily available aid for researchers).

We used Smits and colleagues’ Involvement Matrix to perform the narrative analysis (see Fig. 2). The matrix was designed as a conversation-tool to discuss roles and expectations to support PPIE in research [94]. We have used the matrix to also describe researchers’ roles, as to our knowledge no model for analysis of researcher roles in partnerships with patients exists. We scrutinized the full papers for descriptions of roles to populate the matrix. This information was scattered throughout the papers; sometimes it was found in the methods section, but most often in designated PPIE-headlined sections or in the contributions or acknowledgement section. Authorship requires substantial contributions to the research process and article write up as recommended by the International Committee of Medical Journal Editors [95]; therefore, to understand different levels of partnership, we stratified the 40 articles in PR co-authored papers (n = 16) and non-PR co-authorship (n = 24). All authors discussed the extracted data.

Fig. 2
figure 2

Involvement Matrix (reprinted with permission)

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Meta-synthesis Finally, a meta-synthesis of enablers and outcomes described in the 40 articles was performed. Papers were analysed for value creation and outcomes related to and enabling actions in the partnerships. This information was found under findings, evaluations, self-reflections, or discussion sections depending on the scope of the article. Those sections were thoroughly read and information was extracted using a purposefully-developed matrix. The information was then synthesised and reported in Fig. 5.

Results

A total of 5261 potential hits were collected in Endnote 20 2.01 and transferred to Covidence 2.0 (Covidence.org) for screening and full text analysis. After deduplication, 3667 records were screened for title and abstract. Twenty-five percent of the records (918) were independently screened by two researchers (AWK and MLK) and inclusions compared for disagreement (15%). Disagreements were discussed and resolved by an external referee. The remainder of articles were screened by one researcher (AWK), who also screened the 285 articles eligible for full text reading. Seventy articles were included for analysis. A searchable full list is available at the Open Science Framework and will be available on the website for Center for Research with Patients and Relatives at Odense University Hospital [96].

Descriptive overview

We found 70 articles eligible for inclusion; the total number of articles reflecting on and evaluating PPIE activities increased progressively between 2012 and 2021 (see Fig. 3).

Fig. 3
figure 3

Articles grouped per publication year

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The geographic origin of studies is polarized predominantly between the UK (n = 32), Canada (n = 9), and the USA (n = 7). Other industrialized countries account for minor contributions: Denmark (n = 5), Netherlands (n = 4), Germany and European collaborations (n = 3), Norway, Ireland and Australia (n = 2) and Sweden (n = 1). Different research areas are represented (see Table 1) with mental health leading with 21 publications, followed by health services research (n = 11), and oncology (n = 6). A qualitative research design was most frequently used (n = 21), but more traditional biomedical research designs such as clinical trials, randomized controlled trials (RCTs), health technology assessments (HTA), register studies, surveys and reviews were also represented (see Additional file 1: Appendix D Table S2 for visualization of results). The included articles cover a wide range of involvement formats from advisory boards, being consulted once on a project [97], to full coproduction at all stages of a project [1]. All steps in the research cycle are represented: from research agenda generation to dissemination activities. Thirty-eight of 70 papers reported including patients in the whole research cycle; if patients were involved in just one step, the design phase (n = 11) was most frequently reported. Using authorship listing and information in the contribution and affiliation sections, 33 articles were identified as being co-authored by PRs. For one article we were unable to determine whether PRs had been co-authors, and thus classified this [51] as non-co-authored. Articles described inviting PRs with lived experience of the condition or service under investigation, yet in 5 articles the authors did not report any details on who the PRs were or reasons for selecting them [2, 21, 58, 64, 69].

Articles mentioned a total of 21 different frameworks for involving PRs, yet a large group of articles (n = 19) did not mention a specific framework guiding the collaborative processes. Geographical differences in the frameworks used can be seen with only European and UK-based articles referring to INVOLVE guidelines and/or the GRIPP reporting tool—both originating from the UK. In articles with no frameworks specified, 12 out of 19 had PRs listed as co-authors.

Authors described both positive experiences and challenges related to PPIE activities. However, all 70 articles report that the involvement activities ultimately resulted in positive changes in the projects, ranging from researchers gaining new perspectives on their project [12], reformulation of questions in questionnaires [37], changing the intervention design [35], and collaboratively developing guidelines [4]. A few articles mentioned how the researchers were worried that the PPIE in their research project would decrease scientific rigour [69], not be taken seriously [32] or fail to obtain legitimacy amongst clinicians [35].

Narrative analysis of partnership roles

The role of both researchers and PRs in the partnerships was determined using Smits et al., Involvement Matrix in the 40 selected articles marked with an asterisk in Table 1. The results show that PR roles in non-co-authored articles are: listener, co-thinker, advisor, and partner. One article mentioned that PRs had decision-making authority [42]. See Fig. 4 and (Additional file 1: Table S3 in appendix for data details). PRs’ roles changed during the projects throughout the research cycle: In the earlier stages of research question and protocol development, PRs’ role is most often described as listener or advisor. This was difficult to determine as few articles reported clearly on PRs' roles in the early stages of the research cycle. During the design stage PRs most often had the role of advisor or partner. The role of partner was often described where PRs had been involved in the design, data collection and analysis stage. When PRs were involved in several steps of the research cycle they were more frequently described as partners in the project. Few articles described PRs being involved in the write-up and dissemination stage [6, 24, 42]. The most common role for the researchers was ‘Decision-maker’ (the one who takes initiative and/or makes final decisions). This role did not change during the research cycle.

Fig. 4
figure 4

Visualization of roles within non-co-authored and PR co-authored articles using the Involvement Matrix. Research Q = Research Question, R = Researcher, PR = Patient & Relative

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PR role in PR co-authored articles was most frequently described as partner—especially at the execution and implementation stages. In the early stages of the research cycle, PRs had the role of advisor or listener. Again, few papers described the early stages of the projects clearly, therefore information is missing, and results should be treated with caution. After research question development, researcher role in PR co-authored articles was also most frequently described as partner. Their role seemed more flexible and change as the project progressed through the research cycle and several of the projects described PR and researcher roles as dynamic and shifting between both parties taking the lead and partnering.

Meta-synthesis of partnership enablers and outcomes

Included articles described several enablers that make the partnership or make it possible. An overview is presented in Fig. 5.

Fig. 5
figure 5

Overview of enablers and outcomes for PR partnerships in included articles (n = 40)

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Training Several articles reported that researchers had provided training for the PRs to be able to contribute to the projects [1, 6, 13, 15, 22, 26, 34, 35, 42, 43, 55, 62, 69]. PRs also mentioned that they needed training and support to gain confidence to contribute at the same level as the researchers [1, 13, 15, 30, 43, 58]. A few articles [15, 30, 34, 69] mentioned training for researchers in PPIE as it was a novel territory for them, and one article [63] described that the PRs taught the researcher in their understanding of health and disease.

Personality and communication skills Finding a common language stripped from medical jargon was described as important; one paper mentioned that PRs made researchers aware when this happened [35]. PR personality and communication skills were described as important in the partnerships: being “pleasant collaborators” [9], to be “able to reflect their experience in a wider context” [4], “having the physiological and psychological means to contribute” [7], having “interpersonal skills to facilitate collaboration” [4], being able to “expresses him/herself clearly and simply” [4], and one patient mentioned “communication is my key skill” [3]. Two articles mentioned that researchers can also have strong personalities [11, 58] which can hindrance to the partnership.

Remuneration Six out of 24 non-co-authored articles [9, 24, 39, 42, 55, 70], and 9 out of 16 co-authored articles [3, 4, 7, 8, 15, 26, 32, 35, 41] mentioned remuneration or travel reimbursement as important. A few PRs declined [4, 6, 9] explaining it would change the relationship and bring more responsibility, or accepted remuneration, but felt as a volunteer [3].

Time The more steps the PRs are involved in, the more the influence of the PRs on the project and partnerships was reported as strong [9, 39, 51, 53] suggesting a longitudinal causality. Time was also mentioned as a factor in shorter partnerships as time spent on informal talks pre- and post-meeting helped build the relationship [15] and allowed for time spent together to reflect during the process [41]. However, time could also be a challenge, for example due to time pressure of other competing research activities [62]. Activities were less successful when “substantial” time and efforts were needed to organize and plan meetings [51] and when PRs had to spend time on activities in between meetings [9]. It was also mentioned that moving beyond consultation with PRs required extra time and workload [8].

Trust When PRs felt that they “were actually listened to” [17, 32] it helped the collaboration and created trust between the parties. Some PR co-authored articles described as PPIE intrinsic to the research project as PRs’ knowledge and perspectives actually made the research possible [19, 26, 32, 35, 40, 41, 55, 63]. In these papers PRs were described as: partners to the researchers in facilitating and conducting interviews [19], shared decision-makers when “working alongside researchers to coproduce interpretations” [32], essential to the research because they were gate-keepers to the community, a critical friend and [26, 55], the ones who accepted the researcher [63] and validated and consolidated the researchers’ point of view [35]. The researchers were trying to obtain legitimacy and gain PRs’ trust by initiating partnerships on the PRs’ terms. The researchers did so by focusing on creating supportive environments and levelling out power differences and by actively seeking acceptance of their suggestions.

The outcomes of PPIE

The outcomes reported for both co-authored and non-co-authored articles focus on impact for the research project (see Fig. 5). Authors mentioned: increased recruitment and retention in the studies as a result of the PPIE [7, 34], more in-depth data analysis [6, 39, 42], improved quality of the project [6, 11, 17, 33, 45, 58, 98], creation of new knowledge and exchange of knowledge of and aspects of a disease [1, 25, 28, 30, 42, 53, 55, 57, 62, 64], fulfilling funding requirements [6, 9, 43], and gaining access to the field of study [26, 55]. Personal accounts of PRs were persuasive [35] and changed researchers’ perspectives [19]. A few articles mentioned that the goal of collaborating with PRs was to create the research project around the PRs’ experiences. The PR groups here included black, Asian and minority ethnics [26], aboriginals [63], abuse survivors [32], mental health services users [39, 42, 70], people with spinal cord Injuries [40], and people with aphasia [45]. The value of working with PRs in those partnerships was described as “to enable service users to find voice and freedom” [32], to create research which makes a change in the lives of people [40], a way of bringing disadvantaged groups into research [63]. Articles reporting on personal value for PRs mentioned benefits as: a social opportunity to meet fellow experiencers [15, 45], to gain confidence [17, 28, 30, 33, 55] and feel empowered [17, 28, 39, 55], to be part of change or improvement [8, 33], to find a new job [39], and to get affirmation as a human being [42].

This project’s patient and relative partners’ observations and reflections

We, the patient and relative panel, selected 11 of the 70 articles to read and analyse. We selected Danish articles (n = 5) because we are from Denmark and sought to find a certain familiarity with the research and learn what is happening in Denmark on PPIE, and some international articles (n = 6) which had a focus on treatment and care for illnesses identical or similar to what we have experienced as patients and relatives [1,2,3,4,5,6,7,8,9,10,11]. The selected articles mostly described the involvement well and thoroughly. We found that the researchers had done a lot of work and focused on hearing what patients needed. Thus, it was difficult for some of us in the group to critically reflect on the researchers’ work, because we don’t know what challenges they faced or what considerations were behind the choices they made.

We would like to comment on the themes training and recruitment as reported in the articles. Pomey et al. [4] mentioned the importance of the right recruitment process and patient match, and Miah et al. [1] described not having minority groups represented in their study as a weakness. We believe it is important that researchers consider carefully how they can find PRs that have true lived experience within the area of research as well as taking care to seek diversity. Many of the groups were homogeneous, and we believe that a group must be diverse to deliver different views. If researchers would look for more diversity, they need to be more flexible in meeting time and place and recruitment processes. We believe it is important to consider whether all PRs need the same training—different people will also have different needs for training.

We also found that the selected articles described a power difference between PRs and researchers; it is important to be aware of the power balance between researchers and PRs. Lindblom et al., described that the PRs felt inferior to the health professionals during the research process [11] and Pomey et al. described how PRs were more comfortable having meetings without the researchers [4]. We consider the number of PRs partaking in a project as crucial in this matter. We think that the fewer PRs involved in a project, the more training and support they will likely need to be able to contribute on equal terms.

Researchers can inadvertently get the reply they are looking for if the PRs are only consulted briefly in one part of the research project. In the 11 articles we read, when researchers and PRs worked in the same group, a reciprocal learning dynamic was described. Therefore, having workshops or meetings with only patients or only researchers, it seems much learning between the two could be lost.

Some of us found it challenging to read the articles, due to reading academic papers in a foreign language and being unfamiliar with the structure of research articles. We had made a support tool for what to look for in the articles, but even then, we needed considerable time as we had to go over the articles several times. It has been interesting to get an insight into how eager and engaged researchers were to involve and collaborate with PRs. We would like future articles to report more on the outcomes of the involvement as experienced by the PRs: what do they gain from the different partnerships?

Discussion

We searched for papers that reported on researcher and PR partnerships as part of their description and or evaluation of the PPIE process. We found 3667 hits, briefly described the 70 eligible papers for inclusion, and performed a more in-depth analysis of the partnerships using the Involvement Matrix on 40 papers. We see that researchers predominantly took on the role of decision-maker and the PPIE tasks were often described as predetermined by the researchers. As such, researchers defined the PRs’ role in most partnerships. Some of the articles pointed out that this was important to mention at onset and clear role boundaries were perceived as positive by researchers and PRs. The yielded outcomes of PPIE were described as positive, often growing beyond initial expectations; so perhaps the full potential of a partnership is hard to reach when setting clear boundaries from the beginning. The most frequently described enabler was PR training, and both researchers and PRs felt training increased their ability to contribute. Others found offering systematic PR training builds patient capacity for engagement and helped legitimize their role [99]. Green et al. found that when members of the public fulfilled a designated role, they needed training and other support to equip them for this role and fit in a preexisting research structure [100]. Jones and Pietilä (2020) report how this results in PRs aligning themselves with health care professionals and adopting professional language to obtain legitimacy [75]. Our findings suggests, as per existing studies, that often what PRs bring to research projects are filtered lived experiences, tailored to meet dominant hermeneutical framework and adjusted to be compatible with existing research structures. Generally, our findings suggest that involved PRs were a homogenous group, and that active steps were taken to make sure that the PRs were pleasant collaborators with a constructive attitude who could express themselves clearly and simply. We need to be mindful that if only a selected group of patients are heard sharing filtered lived experiences, we risk excluding other perspectives whilst additionally creating a new norm(al) which will alienate other patients from their own (and perhaps different) experience [101], contributing to what Miranda Fricker [102] labels as hermeneutical injustice in PPIE. PPIE has the potential to decrease epistemic injustices in health care by helping mutual understanding between clinicians and patients [103], care should be taken to find breath in the PRs invited and allow them to contribute without having to make attempts to fit the hermeneutical and structural framework of the research world.

Overall, all articles reported positive about their PPIE practices which could indicate a reporting bias as negative experiences may be less pleasant to acknowledge, formulate and publish. Others have published in the past on potential negative consequences of PPIE such as abandonment of research ideas [104], and we believe it is important to continuously have honest conversations about both negative and positive aspects of PPIE. For example, are there cases where PPIE does not lead to changes, and if so, how do we as researchers navigate informing PRs (and funders) about this? Some researchers were concerned for the quality of the research and the opinions of fellow researchers when PRs were to be involved. Others have examples of researchers who omitted that PRs were involved out of fear of having the project rejected [100]. In this review, new knowledge and sharing knowledge were the most frequently reported positive outcomes of PR partnerships, and articles reported that PPIE improved the overall quality. Hence, concerns about experiential knowledge negatively impacting a project seem unwarranted and could benefit a more detailed analysis in the future.

Our analysis showed that when PRs were co-authors, they were more frequently described as partners through most steps of the research cycle and in this way, co-authorship legitimized the PR contribution. There is sparse literature addressing authorship in PPIE research; Richards et al., offered co-authorship as a way of giving credit to someone who made “important intellectual contributions” in a co-production process [105]. Despite of rigorous definitions of co-authorship (i.e. by ICMJE [95], co-authorship attribution is not always in line with these guidelines.. In this article we used PR co-authorship as a variable in our analysis; this provided us with insight into the PPIE practices behind PR-co-authored articles. Our findings showed that PRs earned their authorship by being partners in most parts of the research process.

In a review of reviews, Hoekstra et al. [80] found that partnership descriptions largely depended on research area and country origin of first author. We had similar findings and saw no clear association between PPIE labels or frameworks used and actual partnership practices. This review showed the importance of communication and personal skills, and as per existing literature, these findings suggest that to understand the gains of PPIE activities/practices, we cannot look solely at labels or frameworks; we must also investigate interpersonal relationships and partnership dynamics. As reported, both researchers and PRs can be “strong or difficult personalities” [58]; illustrative of how interpersonal skills are perhaps paramount these elements were only reported as recruitment criteria for PRs and not as a theme for training of researchers. Interpersonal skills of researchers should be an area for future focus.

Strengths and limitations

This review offers an overview of 70 articles reporting on PPIE activities as well as in depth analysis of a selection of those. The Involvement Matrix may not provide a full representation of partnership roles, as a few articles couldn’t be mapped on the matrix as they lacked thorough descriptions of the PR-involvement throughout all stages. This may have skewed the mapping results, but the mapped papers showed a trend which we feel is representative of our data.

The format of a rapid review is intended to explore the current trends and knowledge on a subject. It is meant to be a quick process (commonly less than 6 months [83]) to assess current knowledge about a policy or practice [82]. Perhaps as reporting on PPIE experiences is a relatively new field, with a lack of agreement on key definitions, this review did not unfold as rapid as intended with much scrutiny needed to extract data from each included article. We tried to alleviate work for future reviews by including a ‘patient partner contributions’ section making their contributions clear. PPIE activities are commonly found to be under-reported and under-reflected [106]. We found especially that research purpose and preparatory stages like origin of research idea and development of protocol were generally under-reported. GRIPP 1 and 2 do not provide a uniform reporting style as anticipated in our inclusion criteria. The IMRAD format for journal publications may limit PPIE reporting [107] and more openness to report personal outcomes for both PRs and researchers could perhaps alleviate this. Until this becomes mainstream, a future focus on actual activities and relations rather than terminology can help shed light on outcomes and impact of PPIE in health research.

Conclusions

In research partnerships between PRs and researchers, researchers most often have decision-making roles, which gives them control of where, when, and how to involve PRs in their projects. As PR-researcher collaborations seem to evolve during the projects, their full potential may not be reached if fully planned from the start. Co-authorship is can be an acknowledgement and legitimization of PR contributions—and should be used as such, yet, currently happens most often when PRs have had the role of partner in several parts of the research cycle even though they might have made a significant contribution to the research. Across a variety of involvement activities and frameworks, common partnership enablers were found; these include training, interpersonal skills, remuneration, time and trust. Reported PPIE outcomes included: overall improved quality of research and new learning for all parties involved. Care should be taken to include a variety of PRs, and consideration of individual PR needs may create the conditions to invite a more varied group of people into health research.