Background

Over the last several years, there has been a substantial movement toward practical, pragmatic implementation research that will translate into usable health-related policies, programs and practices [1]–[4]. Pragmatic research is conducted internationally in wide ranging settings [5]–[8]. Funding to support pragmatic research and evaluation is provided by major health institutions such as the National Institutes of Health in the United States (U.S.), the U.S. Department of Veterans Health Affairs, the Canadian Institutes for Health Research, and the National Health Service’s National Institute for Health Research in the United Kingdom [9],[10]. Pragmatic research is increasingly being conducted in networks of primary care practices, health maintenance organizations, and other research networks such as the Patient Centered Outcomes Research Institute patient-powered research networks and the clinical data research networks [11].

The differentiation of pragmatic from explanatory research can be traced to a seminal paper by Schwartz and Lellouch [12] wherein they define explanatory research as conducted under optimal circumstances to determine the ‘efficacy’ of an intervention while pragmatic research tests an intervention under usual conditions. This distinction is important because trials are frequently designed as explanatory investigations, when the researchers’ intent is actually to answer the pragmatic question of effectiveness under usual or differing conditions. Inasmuch as trials are inadequately formulated for the type of research question asked, research outcomes are compromised and effort wasted [12]. The importance of pragmatic research has been given a major boost by the development of criteria and evaluation tools intended to increase transparency of research and results reporting and provide a means for practitioners and policy makers to assess local applicability of trial findings [13]–[15].

The ‘Pragmatic-Explanatory Continuum Indicator Summary’ or PRECIS framework was developed to assist trial designers to assess where a trial is positioned along the pragmatic to explanatory continuum [16]. The main purpose of PRECIS is to determine the degree to which study design decisions align with the trial’s stated purpose, and thus was originally intended to be used at the design stage. The tool is comprised of 10 domains: participant eligibility criteria, experimental intervention flexibility, experimental intervention practitioner expertise, comparison intervention, comparison intervention practitioner expertise, follow-up intensity, primary trial outcome, participant compliance with prescribed intervention, practitioner adherence to study protocol, and analysis of primary outcome (see Table 1).

Table 1 Summary of the Pragmatic Explanatory Continuum Indicator Summary (PRECIS) and the Reach, Effectiveness, Adoption, Implementation, and Maintenance (RE-AIM) framework criteria
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The original intent of the PRECIS framework was to inform trial designs by providing a visual display in the form of a hub and spoke diagram, where each of the 10 domains are represented by a line depicting the pragmatic-explanatory continuum. No numerical anchors were originally used. The endpoint closest to the hub represented a more explanatory study, whereas the endpoint furthest away from the hub represented a more pragmatic study [16]. However, modifications have been proposed and tested in variety of ways in an attempt to expand its utility to evaluate studies post completion, including use in systematic reviews [17]–[21]. Modifications have included quantifying the pragmatic-explanatory nature of a study by using numeric rating systems, where each domain is scored on a Likert-type scale. The original scale ranged from 0 to 4 where 0 represented an extremely pragmatic study and 4 was extremely explanatory. Over time the range most commonly used has been 1 to 5 (scales of 0 to 4 and 1 to 20 have also been used) [22]. Regardless of which scale is used, all have transposed the endpoints so the smaller number represents an extremely explanatory study and the larger number represents an extremely pragmatic study. Another modification was made to accommodate evaluating systematic reviews. Each study in a systematic review is scored individually on each of the 10 original PRECIS domains [20]. After the individual scoring, a 10-domain average for each individual trial can be calculated, as well as a single domain average across all trials included in the review and an overall combined average for the entire systematic review. Regardless of which version was used, all studies concluded that PRECIS was useful in designing trials and assessing the level of pragmatism of a trial or a body of evidence. However, PRECIS does not include domains to evaluate generalizability and applicability of a pragmatic trial to a specific context. Thus, additional domains are required.

The RE-AIM framework, which is an acronym for reach, effectiveness, adoption, implementation, and maintenance, was created out of the need for improved reporting on key issues related to robustness, translatability, and public health impact of health research [23],[24]. RE-AIM was developed as a response to trends toward research conducted under optimal efficacy conditions instead of in real-world, complex settings [25] and is intended to be used at all stages of research from planning through evaluation and reporting, and across different types of research (e.g., effectiveness, implementation, and dissemination trials) [26]. RE-AIM domains address issues focused on setting and participant representativeness, setting/site engagement with intervention, intervention adaptation during the study, program sustainability, and monetary/resource costs of an intervention. Over the past 14 years, RE-AIM has been applied to a wide range of conditions and study settings and has evolved to include additional items necessary for translation of research findings, such as use of qualitative methods and assessment of unanticipated consequences, both negative and positive (e.g. generalization effects). These domains address pragmatic and external validity issues not included within the PRECIS domains and are shown in Table 1. Originally, RE-AIM domains were not defined by a rating scale [23]. The first scale was modeled after our first use of the PRECIS rating scale that ranged from 0 to 4, where 0 represented an extremely pragmatic study and 4 was extremely explanatory. With subsequent uses of the RE-AIM domains, the scale has been changed to remain identical to the PRECIS scale where the smaller number represents an extremely explanatory study and the larger number represents an extremely pragmatic study.

The purpose of this article is to build on the work that has been done on the use and applicability of the PRECIS and RE-AIM frameworks by summarizing our experience applying these models to three studies that have combined both frameworks to provide a more robust and comprehensive assessment of issues related to translation of research. We begin by describing experiences of using both PRECIS and RE-AIM frameworks in three different studies. Thereafter, we summarize lessons learned using the combined criteria and make recommendations for future use. We conclude with a discussion on implications for the broader issue of designing and reporting results for studies intended to promote translation into policy and practice.

Methods

Description of studies to illustrate use of the frameworks

The following three studies illustrate our experiences applying both PRECIS and RE-AIM frameworks. These three studies were selected because they are the only studies to our knowledge that have combined both frameworks, we have access to the data, and they illustrate different applications (e.g., planning, use to describe different interventions in a collaborative project and to conduct a literature review).

The Practice-Based Opportunities for Weight Reduction (POWER) Trials Collaborative Research Group included three individual studies funded by the National Heart Lung and Blood Institute (NHLBI) [19]. Although the studies did not share a common intervention protocol, all three tested a primary care-based intervention to reduce weight among obese primary care patients who had at least one other cardiovascular disease risk factor [27]. The POWER trials had common components to facilitate potential cross-site comparisons, but each protocol also incorporated distinct, trial-specific elements including different interventions and different secondary outcome measurements (see Table 2).

Table 2 Use of the Pragmatic Explanatory Continuum Indicator Summary (PRECIS) and the Reach, Effectiveness, Adoption, Implementation, and Maintenance (RE-AIM) Framework domains to evaluate three studies
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The second study was a systematic review of eHealth cancer prevention and control intervention trials [28]. For this review, eHealth interventions were defined as ‘the use of emerging information and communication technology, especially the Internet, to improve or enable health and health care’, [29] and included email, mobile phone text or applications, interactive voice response, automated and electronic programs, and computer tailored print but excluded telemedicine targeted solely at clinicians that did not have a patient or consumer facing interface. It included 113 studies across the cancer control continuum (i.e., primary prevention, screening, treatment/disease management, survivorship, and end-of-life care) [30].

The third study is the My Own Health Report (MOHR) trial whose primary purpose was to study clinical implementation of and patient experience with the use of an automated health risk assessment and feedback system to help clinics focus on patient-centered care issues [31]. The MOHR trial used a paired, cluster randomized delayed intervention design with nine pairs of primary care clinics. The trial combined elements of pragmatic trials, implementation science, systems science [32], and mixed methods approaches with practical outcome measures [33]. Research teams identified and selected matched clinics that were similar in type (e.g., federally qualified health center, practice based research network, family practice, or internal medicine), and clinical characteristics including geographic region, approximate size and level of electronic health record integration. One clinic in each pair was randomized to early implementation while the second clinic was assigned to the delayed implementation condition.

Training on use of the domains

The three evaluations were conducted during different phases of the research process. For the POWER study, evaluation occurred during the implementation phase of the project. The eHealth evaluation was conducted after study completion as the review consisted solely of published literature, and the MOHR evaluation was conducted in the planning phase. A variety of reviewers were used in the three different evaluation exercises as described in Table 2. In the POWER trial, reviewers familiar and not familiar with the research protocols being evaluated were used. In eHealth, one reviewer was the lead investigator for one of the included studies. However, he was not assigned to review the study. None of the other reviewers were associated with any of the published works included in the review. In the MOHR trial, individuals indirectly associated with the study were used as reviewers. In all three cases, individuals were highly educated and trained in the research process as described below and in Table 2.

While the training process for the reviewers varied across each evaluation, all began in a similar fashion with reviewers studying the original PRECIS article [16] and the PowerPoint presentation by Dr. Sackett [34], and having two or more group meetings to discuss application of the rating criteria. The POWER study was our first use of the PRECIS framework. After review and discussions on applying the PRECIS domains to the POWER protocols, it was evident that additional domains were necessary to capture key contextual factors for translation. Thus the additional domains from the RE-AIM framework were added. Reviewers then re-assessed each of the protocols with the additional RE-AIM domains. The eHealth study had reviewers not familiar with the RE-AIM framework read the original RE-AIM article [23] in addition to reviewing the PRECIS training materials. Multiple training sessions were held to develop consensus on both frameworks among raters on all domains. The rating form that included both sets of evaluation criteria was piloted and refined based on the ratings of a subsample of four papers by all reviewers. After refinements and clarification of the rating process, all reviewers evaluated two additional papers to pilot the revised criteria. The MOHR study conducted a one-hour training session to review the criteria as a group and instructions for using the criteria.

Use of the domains

All three projects were rated on a 5-point Likert-type scale for the PRECIS and RE-AIM domains. The POWER study used the original 0 – 4 scale, as described in the Sackett presentation, where 0 was extremely pragmatic and 4 was extremely explanatory. However, the eHealth study used a 1 – 5 rating scale, as described in Koppenaal, et al.[20], and the MOHR study used a 0 – 4 scale, both such that the lower score, the more explanatory the trial and the higher the score, the more pragmatic the trial. In addition, the POWER and eHealth studies created composite scores for both PRECIS and RE-AIM domains.

In the POWER study, reviewers independently rated each of the three protocols on all PRECIS and RE-AIM domains using a paper rating form. In the eHealth study, two reviewers were randomly assigned to each study and reviewers rated approximately 38 studies each. All rating information for each study was collected via a web-based form in Survey Monkey. In the MOHR trial, reviewers rated the study protocol using a paper rating form.

Different approaches to inter-rater reliability were used because the three different studies had vastly different designs, strategies for allocating reviewers, number of reviewers, and number of studies rated per reviewer. Therefore, the approaches to assessing inter-rater reliability differed as well. For POWER, intraclass correlation coefficients were calculated for individual items and an overall kappa was calculated for each of the composite scores [19]. In the eHealth review, weighted percent agreement scores for PRECIS and RE-AIM domains were calculated [28]. For the MOHR study, percent agreement score for each PRECIS and RE-AIM domain was calculated using a standard of exact agreement [31].

Results

Experiences using PRECIS and RE-AIM to evaluate three different studies

The POWER trial was our first experience using PRECIS and the first numerical rating using RE-AIM domains. Although the PRECIS article examples and the presentation were useful background, there were several issues that were unclear to some reviewers, and we found it necessary to add explicit anchors for the ratings and to rate and discuss example studies not part of the formal evaluation. We also identified one person from each of the three POWER research centers very familiar with that center’s protocol, not a reviewer (e.g., a program manager) who was available to answer any questions and clarify issues that were unclear to reviewers from the study protocols.

The review of eHealth cancer prevention and control intervention trials was the first published article using PRECIS and RE-AIM to evaluate eHealth intervention (EHI) studies. Several unanticipated issues were unique to applying such domains to EHI studies. For studies in which EHI replaced practitioners with no personal or phone contact, ‘not applicable’ ratings were applied to relevant PRECIS domains on practitioner expertise and practitioner compliance to study protocol. Any discrepancies in ‘not applicable’ ratings between reviewers were identified and discussed for consensus during the data cleaning process. Additionally, reviewers had to discuss and agree upon assignment of experimental and control interventions for studies in which multiple interventions were compared. For these studies, the most intensive intervention served as the experimental arm and the least intensive intervention served as the control arm. We also found that few studies reported on factors related to cost and setting representativeness relevant to the RE-AIM domains and therefore, could not rate such aspects of the individual studies.

Because the MOHR study only used three reviewers for one protocol that they were already familiar with, there were far fewer issues in terms of training and rating. However, the reviewers did feel that the RE-AIM domains did not capture one factor they felt was important to generalizability, patient engagement. As such, this domain was added and rated. The reviewers tended to rate some aspects of the protocol highly with regard to pragmatism and generalizability. However, this was not consistent across specific domains and consensus discussions seemed to resolve any bias towards these responses.

Lessons learned using PRECIS and RE-AIM frameworks

These three diverse applications illustrate that both the PRECIS and RE-AIM frameworks can be used for diverse purposes and across diverse content areas and types of studies. The following lessons can be taken from this experience. First, although the domains can be reliably coded by a variety of research staff after a short training activity, time should be dedicated to discussions about precise definitions for each domain and practice using the criteria (see Table 2). Second, reviewers in all studies found that the RE-AIM domains in combination with the PRECIS domains addressed important additional information related to pragmatic research. Both sets of domains can reveal meaningful differences across studies and across domains within a study. The most consistent and largest differences across studies were that studies were less pragmatic on the RE-AIM domains than on the original PRECIS domains (see Table 3). In particular, adaption, sustainability, and costs were seldom reported. It is both sobering and ironic that these types of issues are precisely the ones about which stakeholders most need information to consider adoption and replication of an intervention program [3]. Third, two of the three evaluations had reviewers who were directly or somewhat directly related to the study being evaluated. It was observed that reviewers directly involved with a study tended to rate their own study as more pragmatic than others. Having reviewers who are both familiar and unfamiliar with an intervention or program could help minimize, or control for, this finding. Fourth, given the nature of eHealth interventions, reliance on technology as the intervention delivery mechanism, the role of the practitioner (i.e., practitioner expertise and adherence in PRECIS) was not applicable to many of the self-administered intervention studies. The impact of not scoring these two PRECIS domains is unclear and thus warrants further discussion on how to best incorporate or properly rate domains when used with eHealth and other automated intervention studies.

Table 3 Average ratings (standard deviation) on PRECIS and RE-AIM domains: scores by study
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Fifth, given the PRECIS and RE-AIM domains focus on trials that have explicit experimental and control arms, reviewers had to designate study arms as experimental or control in research that compared three or more interventions. This is likely to present similar challenges to research that studies multiple arms, such as comparative effectiveness research, adaptive design interventions, or multi-component intervention trials. Sixth, there was difference of opinion regarding the value of calculating a summary score for both PRECIS and RE-AIM domains. Calculating such a score can be helpful but also potentially misleading. The summary score can give a sense as to where a study falls on the pragmatic-explanatory continuum as whole, but it masks the diversity of the individual domains. For example, two studies could have an identical overall PRECIS summary score. However, one study might have been much more explanatory in terms of eligibility criteria for trial participants and the other trial much more pragmatic on this domain. It is recommended that when overall summary scores are used, individual domains should also be reported to identify how results on different domains contribute to the overall score and to be able to assess how each domain aligns with the purpose of the study.

Discussion

An increasing number of programs and studies claim to be pragmatic. Use of both PRECIS and RE-AIM frameworks can be used to demonstrate specifically where and how an individual study, or group of studies, is and is not pragmatic. Comparing ratings of domains within the same study allows for understanding the pragmatic versus explanatory design elements of the trial. Whereas comparing domain ratings across trials allows clinicians, policy makers, and study reviewers to compare across studies to make meaningful judgments about which intervention has generalizability and applicability to their population(s) of interest and the level of reasonable effectiveness that can be expected in different contextual settings versus those in explanatory trials.

Several evaluation frameworks have been developed to facilitate translation of research findings. However, many are designed solely for evaluation [35]. Combining both PRECIS and RE-AIM allows for standard reporting of both development and evaluation over the life course of a study. In the planning phase of a study, PRECIS allows for assessing the match between the trial design and the research and RE-AIM can be used to provide greater detail relative to some PRECIS domains (e.g., description of eligibility criteria and calculation of reach), and also to address other issues not in PRECIS important to potential adopting settings (e.g., costs required, representativeness of settings). RE-AIM can be used across the entire span of the study to understand the why behind success or failure of a study by describing the context in which the study occurred [36]. PRECIS can be used periodically throughout the study and at study conclusion to assess how adaptations and changes made over the course of the study impact the design and whether the end result still aligned with the original purpose of the study, respectively.

There is considerable benefit to using both frameworks to assess key components necessary for designing and reporting results for studies intended to promote translation of research into practice and policy. However, there are still many questions that need to be explored as use of both frameworks increases. First, what is the best rating scale to use? Is a 5-point Likert scale or some other scale the best way to evaluate a study or should one solely use a diagram without defined end-points? Is there value to using a scale to assess each PRECIS and RE-AIM domain or is a visual diagram sufficient? If a visual diagram is sufficient, is the PRECIS ‘spoke and hub’ diagram effective for also displaying the RE-AIM domains?

Second, use of some PRECIS domains to rate some health services studies is currently problematic. For example, in the eHealth review, there were studies that evaluated automated interventions without involvement of practitioners, with no personal or phone contact. ‘Not applicable’ ratings were applied to the PRECIS domains on practitioner expertise and practitioner compliance to study protocol (see Additional file 1). Is this the right way to apply the domains or should it be given a score? Moreover, usual care comparison conditions could be viewed as either explanatory or pragmatic depending on the lens of the evaluator. For example, how would participant compliance be rated when a health educator meets with a patient regarding self-management of diabetes and the educator encourages the individual to problem solve concerning self-monitoring their blood sugar levels and/or exercise more frequently to reach their health goals? This is usual care so could be viewed as extremely pragmatic in nature. However, it could also be viewed as being explanatory as it is encouraging patients to be more compliant. Thus, use of RE-AIM in addition to PRECIS can help complete, or at minimum, provide additional information to help understand why PRECIS domains might be viewed as not relevant or interpreted differently by two different evaluators.

Third, who should be a reviewer? There are pros and cons to including reviewers who are intimately familiar with a project versus those who are completely independent. Although not investigated in these three studies, these domains could be used by both researchers and stakeholders including patients and practitioners to help collaboratively design pragmatic studies. Additional studies are needed to determine if the finding that those familiar with a study rate it as more pragmatic is a generalizable phenomenon, as we observed in the ratings of the MOHR study. If so, this would imply that familiarity with a study should be balanced across studies to prevent potential bias.

Strengths and limitations

This evaluation only included three studies, and replication, especially in different content areas and types of settings, is needed. Other researchers are invited, especially those involved in team science [37] and community engaged projects to use the PRECIS and RE-AIM frameworks to increase collaboration and transparency, as well as for program planning and adaptations. Also, since the RE-AIM domains were developed to supplement the PRECIS domains for each of the three applications reported, the specific RE-AIM domains varied slightly across studies. The PRECIS domains are due to be revised later in 2014 [22], and at that time, it may be possible to also arrive at a common, standard set of accompanying RE-AIM domains, assuming they are still needed to supplement PRECIS. Strengths of the paper include the consistency of results and general usefulness of these rating tools across three different content areas, different phases of the research enterprise, and by different types of reviewers.

Conclusion

The importance of pragmatic trials and dissemination and implementation research to improve health and health care delivery in the U.S. is gaining increased attention [38],[39]. Reporting on pragmatic rating criteria such as the PRECIS and RE-AIM scales can increase transparency and help reviewers and potential adoption settings make more informed judgments about programs and their applicability to different settings and under different conditions. However, because pragmatic research focuses on real-world applications of interventions, understanding the context in which it occurred is critical. Understanding whether a study design aligns with one’s research question in terms of being pragmatic versus explanatory should not stand alone without an understanding of how the context of participants, setting, and processes involved affected the results. We encourage those planning and evaluating health research interventions to use and report on PRECIS and RE-AIM domains, and to contribute to their refinement.

Additional file