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Existing guidelines on overviews of reviews and umbrella reviews recommend an assessment of the certainty of evidence, but provide limited guidance on ‘how to’ apply the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) to such a complex evidence synthesis. We share our experience of developing a ‘general principles’ approach to applying GRADE to a complex overview of reviews. The approach was developed in an iterative and exploratory manner during the planning and conduct of an overview of reviews of a novel molecular imaging technique for the staging of prostate cancer, involving a formal review by a group of 11 methodologists/health services researchers. This approach was developed during the evidence synthesis process, piloted, and then applied to our ongoing overview of reviews. A ‘general principles’ approach of applying the domains of GRADE to an overview of reviews and arriving at an overall summary judgement for each outcome is presented. Our approach details additional factors to consider, including addressing both the primary study risk of bias as assessed by the included reviews and the risk of bias of the systematic reviews themselves, as well as the statistical heterogeneity observed in meta-analyses conducted within the included reviews. Our approach distilled key principles from the relevant GRADE guidelines and allowed us to apply GRADE to a complex body of evidence in a consistent and transparent way. The approach taken and the methods used to develop our approach may inform researchers working on overviews of reviews, umbrella reviews, or future methodological guidelines.
Coffee is a widely consumed beverage, which has been extensively studied for its potential effects on health. We aimed to map genetic evidence for the effect of habitual coffee consumption on health. We searched PubMed, Embase, Cochrane Database of Systematic Reviews, CINAHL and two preprint repositories from inception to 30/09/2022, and included 59 studies, spanning 160 disease or biomarker associations. We evaluated the articles for certainty of evidence using a modified GRADE tool and robustness of the associations by comparing MR sensitivity analyses. Coffee consumption was associated with smaller grey matter brain volume in one study, and there was probable evidence for an increased risk of Alzheimer’s disease and younger age of onset of Huntington’s disease. MR studies provided probable evidence for an association with increased risk of esophageal and digestive cancers but protective effects for hepatocellular carcinomas and ovarian cancer. We found probable evidence for increased risk of type 2 diabetes mellitus, osteoarthritis, rheumatoid arthritis, menopausal disorders, glaucoma, higher total cholesterol, LDL-C and ApoB, and lowered risk of migraines, kidney disease, and gallstone disease. Future studies should aim to understand underlying mechanisms of disease, expand knowledge in non-European cohorts, and develop quality assessment tools for systematic reviews of MR studies.
Under the Universal Health Care Act of the Philippines, all health technologies should undergo health technology assessment. This manuscript details the process of the development of the Philippine guidance document for the use of real-world evidence (RWE) in the clinical evaluation of health technologies.
Methods
This study consisted of two phases. Phase 1 was a comprehensive, systematic review of all available HTA methods guides and literature related to the use of RWE in the clinical evaluation of health technologies. Based on the results of the review, a draft HTA methods guide on the use of RWE was created. Phase 2 was a validation study by expert consultation through key informant interviews (KIIs), and pilot assessment of the methods guide.
Results
Seventy-nine articles and nine guidance papers were included, with pertinent information extracted and organized into sections. The first draft covered definitions of RWE, guidance for RWE utilization, scoping and selecting RWE, critical appraisal, data extraction, and synthesis and analysis of RWE. Changes were made to this draft based on the KIIs and pilot assessment results to produce the final output of the methods guide.
Conclusions
This document describes the process of creating a Philippine guidance document that covers the definition of RWE and the appropriate methods for conducting systematic search, screening, critical appraisal, data extraction, data analysis, and synthesis of RWE.
With the increased prevalence of major depressive episodes with mixed features specifier (MDE-MFS), the pharmacological treatment for MDE-MFS has attracted great clinical attention. This study aimed to investigate the efficacy and safety of medication use for MDE-MFS.
Methods
Commonly used databases were searched for the meta-analysis. Primary efficacy outcomes included response rate and the change in the Young Mania Rating Scale scores; the primary safety outcome was the rate of treatment-emergent hypomania/mania. Effects were expressed as relative risk (RR) or standardized mean difference (SMD).
Results
In patients with MDE-MFS, antipsychotics significantly improved depressive (RR = 1.46 [95% CI: 1.31, 1.61]) and manic (SMD = −0.35 [95% CI: −0.53, −0.17]) symptoms without increasing the risk of manic switch (RR = 0.91 [95% CI: 0.53, 1.55]). However, subgroup analysis of bipolar disorder (BD) patients with MDE-MFS indicated that antipsychotics had limited effects on manic symptoms. Mood stabilizers, especially valproate, demonstrated significant effects in BD patients with MDE-MFS by relieving depressive and manic symptoms. For MDE-MFS in patients with major depressive disorder, trazodone has shown potential effectiveness in retrospective studies, while the effectiveness of antidepressants on BD patients with MDE-MFS lacked evidence.
Conclusions
While antipsychotics are first options for MDE-MFS, their effect on manic symptoms in BD patients with MDE-MFS is still unclear. Mood stabilizers may also be considered, and the use of antidepressants remains a topic of controversy. Since our findings are mostly based on post-hoc analyses, the evidence remains preliminary, highlighting the need for further research to produce more conclusive evidence.
Given the ubiquity of organizational change, it is fitting that considerable research has focused on employees’ responses to change, much of it collated in review articles. With the aim of integrating this diverse review literature and providing an employee-centric theorization, we provide a meta-review, a systematic review of reviews. We present the meta-construct of employee change orientation (EChO), which aggregates employee responses, attitudes, behaviors, and the associated psychological mechanisms related to organizational change. Our meta-review includes 50 scholarly reviews published between 2001 and June 2025, drawing on 1,606 primary studies. Through a synthesis of these reviews, we present the EChO framework and taxonomy. We identify areas for improvement, particularly for research design, and generate key insights for change practitioners working with employees experiencing change. Our meta-review contributes by clarifying well-researched areas, extending theorizing, and highlighting the need for further research to understand how employee responses to change influence outcomes.
The diagnosis of an advanced life-threatening illness brings with it existential challenges that activate the attachment system and different attachment styles influence coping with advanced illness.
Objectives
The objective of this work were (a) to analyze the influence of attachment styles of patients with advanced disease and their relatives on emotional distress and other psychological and existential aspects, and (b) to identify the most used assessment instruments to measure it, highlighting those with better psychometric properties in palliative care contexts.
Methods
Articles on attachment published from October 2005 to February 2025 using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guide (PRISMA) were identified by searching PubMed, PsycINFO, Google Scholar, SCOPUS, Dialnet, and the Web of Science databases.
Results
Of 1847 studies identified, 24 were included (21 quantitative and 53 qualitative). Quality assessment revealed low risk of bias and high methodological quality. The main results indicated that a secure attachment style was associated with better coping, adaptation and adjustment strategies to the experience of illness, causing a buffering effect on suffering at the end of life. In contrast, patients with insecure attachment styles presented higher levels of emotional distress, demoralization, existential loneliness, death anxiety and showed a poorer psychological adaptation to cancer. Almost two-thirds of the studies (65.1%) used some version of Experiences in Close Relationships (ECR) scale.
Significance of results
The attachment theory appears to offer a valuable conceptual framework for understanding how individuals may respond to the emotional and relational demands associated with advanced illness and end-of-life care. Its contributions have been increasingly considered in literature addressing psychosocial adjustment and coping in palliative contexts
For the assessment of attachment styles in a palliative context, the most used instrument is the original ECR-M16 scale or its iderived versions.
Military sexual trauma (MST) (sexual harassment or sexual assault experienced during military service) is associated with adverse mental health outcomes. This systematic review assessed international, published, peer-reviewed academic literature and aimed to (1) identify the mental health outcomes of MST for serving and ex-servicewomen, (2) understand whether sexual harassment and sexual assault impact mental health differently, and (3) identify individual differences that may influence mental health outcomes. Included sources were peer reviewed, primary research, which investigated MST as a predictor of mental health outcome(s) in women. Database searches (June 2023, May 2024, and March 2025) yielded 63 studies, most of which (n = 58) were conducted in the United States and used quantitative methods (n = 60). A narrative synthesis approach facilitated data synthesis. Quantitative studies identified associations between MST and adverse mental health outcomes, with qualitative studies providing further context to these associations. Military sexual assault appeared to have a stronger relationship with adverse mental health than other MST experiences. Posttraumatic stress disorder and depression symptoms were associated with further outcomes, such as suicidality, disordered eating, and substance use. Some additional trauma exposures exacerbated the impacts of MST on mental health, whilst social support mitigated negative mental health outcomes. This review identifies significant mental health impacts of MST and highlights the importance of formal and informal support for serving and ex-servicewomen with MST experiences.
Children in care who experience frequent placement changes face an increased risk of negative mental health outcomes. Emerging evidence suggests a bidirectional relationship, where placement instability can both predict and result from mental health difficulties. Understanding the strength and direction of this relationship is crucial for informing policy and practice, yet UK-based evidence remains unconsolidated.
Aims
To conduct the first systematic review and meta-analysis examining the relationship between placement instability and mental health in the UK care system.
Method
This review was prospectively registered on the International Prospective Register of Systematic Reviews (PROSPERO; CRD42024493617). We searched five databases (up to August 2024) for peer-reviewed UK studies that included a care-experienced sample, measured placement (in)stability, measured mental health, and quantitatively examined the relationship between placement instability and mental health. A random-effects meta-analysis was conducted, and study quality was assessed using the Newcastle–Ottawa Scale.
Results
Fifteen studies (N = 6905) were included, with twelve studies (n = 5536) contributing to the meta-analysis. Children with unstable placements were more than twice as likely to experience mental health difficulties compared to those with stable placements (odds ratio 2.07, 95% CI 1.65–2.59). However, evidence on the causal direction of this relationship was limited.
Conclusion
Placement instability doubles the risk of mental health difficulties for care-experienced children, who already face elevated rates of mental disorders. Further research is urgently needed to clarify the bidirectional nature of this relationship and guide targeted intervention. Meanwhile, policymakers should prioritise collaborations between mental health services and local authorities to prevent the cycle of instability and mental health deterioration.
Much work has been done on the role of trauma in obsessive–compulsive disorder (OCD), but the relationship between stressful life events (SLEs) and the onset of OCD remains poorly studied. This study aims to summarize the evidence about the association between SLEs and OCD development.
Methods
For this systematic review, we searched PubMed, Web of Science, Scopus, and PsycINFO databases for studies published from the database’s inception to December 12, 2024. We included studies investigating the prevalence of SLEs among individuals diagnosed with OCD compared to other psychiatric disorders or healthy controls.
Results
Seven studies met the inclusion criteria and were incorporated. Two studies found that OCD patients suffered more SLEs than healthy controls in the year before the onset of OCD. Two of the included studies showed a higher occurrence of SLEs across the patients’ lifetime before the onset of OCD. Three studies were comparable and, therefore, meta-analyzable. Together, they revealed that SLEs in the year before the onset of OCD were associated with a small yet positive pooled effect size.
Conclusions
Our review suggests that SLEs may be highly represented among people with OCD both in the year preceding the disorder’s onset and throughout their lifetime.
Refugees and asylum seekers often experience trauma, leading to high rates of post-traumatic stress disorder (PTSD). However, the extent to which trauma and PTSD impacts social functioning, such as social relationships or engaging with community activities in new environments, remains unclear.
Aims
This systematic review aims to identify key areas of social functioning influenced by trauma and PTSD, with additional analyses stratified by trauma type.
Method
A comprehensive search of five databases, grey literature sources, and reference lists was conducted in February 2025. Included papers explored the impact of trauma or PTSD on social functioning in adult displaced populations post-migration, within the last 30 years. Studies’ risk of bias was assessed using the Mixed Methods Appraisal Tool and the Authority, Accuracy, Coverage, Objectivity, Date, Significance checklist. Data were extracted on associations between trauma, PTSD and social functioning outcomes.
Results
Of the studies, encompassing 15 394 participants, 38 met the inclusion criteria. Our analysis indicated that trauma and PTSD have an impact on multiple domains of social functioning, including post-migration living difficulties, everyday functioning, acculturation and integration, social relationships, and employment and education. War-related trauma predominantly affected psychosocial functioning and integration, whereas interpersonal trauma had a greater impact on social relationships. While most findings indicated a negative influence of trauma and PTSD on these areas, some evidence suggested the potential for post-traumatic growth.
Conclusions
The findings underscore the challenges displaced groups face, alongside the possibility of post-traumatic growth. Future research should focus on identifying factors that facilitate positive adaptation, informing interventions to support social integration in these vulnerable groups.
Individuals with cerebral palsy (CP) experience significant impairments in lower limb mobility, which severely limit their daily activities and overall quality of life. Robotic exoskeletons have emerged as a cutting-edge solution to assist in the rehabilitation of individuals with CP by improving their motor functions. This systematic review, conducted following PRISMA guidelines, critically evaluates lower limb robotic exoskeletons specifically designed for individuals with CP, focusing on their design, rehabilitation interfaces, and clinical effectiveness. The review includes research papers published between 2010 and 2024, analyzing 30 lower limb exoskeletons reported in 57 papers. We analyze each exoskeleton, focusing on its technological features, user experience, and clinical outcomes. Notably, we identify a trend in which researchers are increasingly adapting exoskeleton functions to the specific needs of individual users, facilitating personalized rehabilitation approaches. Additionally, we highlight critical gaps in current research, such as the lack of sufficient long-term evaluations and studies assessing sustained therapeutic impacts. While ease of use remains crucial for these devices, there is a pressing need for user-friendly designs that promote prolonged engagement and adherence to therapy. This comprehensive review of existing gait rehabilitation exoskeleton technologies aimed to inform future design and application, ultimately contributing to the development of devices that better address the needs of individuals with CP and enhance their motor functions and quality of life.
Abstract screening, a labor-intensive aspect of systematic review, is increasingly challenging due to the rising volume of scientific publications. Recent advances suggest that generative large language models like generative pre-trained transformer (GPT) could aid this process by classifying references into study types such as randomized-controlled trials (RCTs) or animal studies prior to abstract screening. However, it is unknown how these GPT models perform in classifying such scientific study types in the biomedical field. Additionally, their performance has not been directly compared with earlier transformer-based models like bidirectional encoder representations from transformers (BERT). To address this, we developed a human-annotated corpus of 2,645 PubMed titles and abstracts, annotated for 14 study types, including different types of RCTs and animal studies, systematic reviews, study protocols, case reports, as well as in vitro studies. Using this corpus, we compared the performance of GPT-3.5 and GPT-4 in automatically classifying these study types against established BERT models. Our results show that fine-tuned pretrained BERT models consistently outperformed GPT models, achieving F1-scores above 0.8, compared to approximately 0.6 for GPT models. Advanced prompting strategies did not substantially boost GPT performance. In conclusion, these findings highlight that, even though GPT models benefit from advanced capabilities and extensive training data, their performance in niche tasks like scientific multi-class study classification is inferior to smaller fine-tuned models. Nevertheless, the use of automated methods remains promising for reducing the volume of records, making the screening of large reference libraries more feasible. Our corpus is openly available and can be used to harness other natural language processing (NLP) approaches.
Depression is one of the most common mental diseases, leading to a decline in both psychiatric and physical functions. One non-pharmacological therapeutic strategy for the management of psychiatric disorders is music therapy.
Aims
To assess the clinical effectiveness of music therapy and its various subscales for managing depressive symptoms (primary outcome) and related problems (secondary outcome) in comparison with other conventional treatments.
Method
A comprehensive search of MEDLINE, Embase, Cochrane Review, CINAHL, PsyInfo and KMbase was conducted to identify randomised controlled trials published up to 31 August 2023. Studies assessing the clinical effectiveness of music therapy for individuals with depression were included, and data on participants, music therapy and clinical measurement scores were extracted. This study was registered with PROSPERO (no. CRD42023466833).
Results
Music therapy was significantly more effective than controls in reducing depressive symptoms (standardised mean difference (SMD) −0.97 [95% CI: −1.23 to −0.71], P < 0.01). This benefit was consistent regardless of music therapy types, delivery methods or provider professionalism. In addition, music therapy was significantly better than controls in improving quality of life (SMD 0.51 [95% CI: 0.19−0.83], P < 0.01) and sleep quality (SMD −0.61 [95% CI: −1.03 to −0.19], P < 0.01), although it showed only a non-significant trend towards reducing anxiety (SMD −0.98 [95% CI: −2.01 to 0.06], P = 0.06). The evidence level was very low due to high risk of bias, inconsistency due to high heterogeneity and imprecision.
Conclusions
Despite the very low evidence level, music therapy may be recommended with weak strength for patients with depression, considering the results of the meta-analysis and the high accessibility and broad applicability of music.
The National Institute for Health and Care Excellence (NICE) in England introduced early value assessments (EVAs) as an evidence-based method of accelerating access to promising health technologies that could address unmet needs and contribute to the National Health Service’s Long Term Plan. However, there are currently no published works considering differences and commonalities in methods used between Assessment Reports for EVAs.
Methods
This rapid scoping review included all completed EVAs published on the NICE website up to 23 July 2024. One reviewer screened potentially relevant records for eligibility, checked by a second reviewer. Pairs of independent reviewers extracted information on the methods used in included EVAs using a prepiloted form; these were checked for accuracy. Data were described in graphical or tabular format with an accompanying narrative summary.
Results
In total, seventeen EVA Reports of sixteen EVAs were included in this scoping review. Five Reports did not specify how many reviewers undertook screening, whereas five did not report data extraction methods. Five EVAs planned to conduct meta-analyses, nine planned narrative syntheses, and seven planned narrative summaries. Eleven conceptual decision models were presented, with available evidence used to construct cost-utility analyses (N = 5); cost-effectiveness analyses (CEAs; N = 4); a mix of CEAs and cost-consequence analyses (CCA; N = 2); one CCA; and one cost-comparison.
Conclusion
Future EVA Reports should enhance the transparency of the methods used. Furthermore, EVAs could provide opportunities for the adoption of innovative methodological approaches and more flexible communication between EVA authors and key stakeholders, including patients and clinicians, companies, and NICE.
Inclusive education, a foundation of modern educational discourse, requires progressive approaches that extend beyond cultural boundaries and promote effective, collaborative learning environments. In this systematic review, we thoroughly examine preservice teachers’ readiness for inclusive education by analysing how their attitudes, experiences, and training shape their perceptions and self-efficacy. Drawing on studies from the past two decades, we report generally positive attitudes toward inclusive practices alongside challenges such as limited practical experience, time constraints, and insufficient institutional support. In this review, we critique current tools for measuring teacher self-efficacy and call for more comprehensive, culturally responsive approaches. Findings indicate that although formal training fosters positive attitudes, its impact is maximised when combined with authentic teaching experiences. Overall, this systematic review underscores the need for an integrated teacher education strategy that bridges theory and practice, thereby equipping teachers with the skills and confidence to meet students with diverse needs.
Major depressive disorder (MDD) is a significant public health concern, and current treatments often have limitations in effectiveness and adherence. Psilocybin, a psychedelic compound found in certain mushrooms, is being explored as a potential treatment for depression. It primarily acts through the serotonin 5-HT2A receptor but interacts with 5-HT1A and 5-HT2C receptors. Its precise mechanisms remain under investigation.
Objectives:
(1) To consolidate evidence on psilocybin’s efficacy and safety for depression and the role of 5HT2a, (2) to identify limitations in the literature, and (3) to highlight areas needing further research.
Methods:
This systematic review follows PRISMA guidelines and analyses 22 studies, including randomised controlled trials (RCTs) and open-label studies. The studies cover various populations, including individuals with treatment-resistant depression, different dosing regimens, and adjunctive therapies.
Results:
Psilocybin therapy shows substantial and rapid antidepressant effects, often after one or two sessions with psychological support. Improvements are sustained for weeks or months in many cases. Psilocybin is generally well-tolerated, with mild adverse effects such as anxiety during administration and transient headaches, which are manageable in controlled settings.
Conclusions:
Psilocybin demonstrates promise as a novel treatment for depression, especially for individuals unresponsive to conventional antidepressants. Further research is needed to refine dosing, explore long-term effects, and understand its mechanisms of action.
The symptoms of anxiety in the outbreak of COVID-19 were so severe that they entered the research literature as the term COVID-19 anxiety. This systematic review and meta-analysis study aimed to identify the variables related to COVID-19 anxiety and the effectiveness of psychological interventions on it.
Methods
In the present systematic review and meta-analysis, the literature was systematically searched in PubMed, Scopus, Web of Science, Science Direct, ISI, and Persian databases such as Noormags and SID on COVID-19 anxiety from January 2020 to April 2022. In the initial search, 105 articles were found. In the data correlation section, 13 studies for the fixed effects model were meta-analyzed. In the interventional section, 14 articles were selected. The systematic review data were extracted, and all statistical data were analyzed by CMA-2.
Results
The results of the meta-analyses for psychopathological correlations with COVID-19 anxiety in 13 articles indicated the correlation between COVID-19 anxiety and other mental states and disorders (P = .0001/I2 = 97.27%). Other findings demonstrated the effect of psychological interventions on COVID-19 anxiety in 14 articles with high effectiveness of these treatments (P = .00/I2 = 85.67%).
Conclusions
It seems COVID-19 anxiety is affected by psychological variables. Hence, psychological interventions represent effective treatments for anxiety due to COVID-19.
The optimal duration for maintaining antidepressant treatment in individuals with obsessive-compulsive disorder (OCD) who achieve symptom stabilization remains unclear.
Methods
This systematic review and pairwise meta-analysis of double-blind randomized placebo-controlled trials (DBRPCTs) compared antidepressant maintenance and antidepressant discontinuation groups in terms of relapse rate at each DBRPCT study endpoint (primary outcome), OCD symptom improvement, all-cause discontinuation, and adverse event-related discontinuation. Furthermore, relapse rates at 4, 8, 12, 16, 20, and 24 weeks were compared between the groups. Risk ratios (RRs) with 95% confidence intervals (CIs) were calculated. The absolute risk reduction (ARR) and number needed to treat to benefit (NNTB) for relapse rates were also estimated.
Results
Nine trials (n = 1084; mean age: 32.8 years; proportion of males: 53.3%) were included. The antidepressant maintenance group had lower relapse rates at each DBRPCT study endpoint (RR [95% CI] = 0.53 [0.42–0.68]; ARR = 21.0%; NNTB = 5) and lower all-cause and adverse event-related discontinuation rates than the antidepressant discontinuation group. The maintenance group also exhibited lower relapse rates at 4 weeks (RR [95% CI] = 0.47 [0.31–0.70]; ARR: not significant; NNTB: not significant), 8 weeks (0.42 [0.31–0.57]; 12.0%; 8), 12 weeks (0.43 [0.32–0.56]; 18.0%; 6), 16 weeks (0.41 [0.32–0.52]; 25.0%; 4), 20 weeks (0.43 [0.34–0.53]; 26.0%; 4), and 24 weeks (0.42 [0.33–0.52]; 27.0%; 4) than the discontinuation group. Moreover, the maintenance group outperformed the discontinuation group regarding OCD symptom improvement.
Conclusions
Individuals with OCD may benefit from continued antidepressant treatment, provided that it is well tolerated.
Indonesia is home to a high number of Critically Endangered land vertebrates. Examining the research on these species is important to improve biodiversity-related policy and management and to provide insight into knowledge gaps. We conducted a comprehensive review of 2,188 publications published during 2000–2021 that studied the Critically Endangered vertebrate species of Indonesia, to understand variations in the level of research on each species and the proportion of research carried out within Indonesia and by Indonesian researchers. Over this 22-year period, research on Critically Endangered species in Indonesia increased, but > 50% of this research was carried out by researchers based outside Indonesia. Moreover, the quantity of research was uneven across taxonomic classes, indicating an imbalance in research attention. Most publications during the period were on mammals (1,573 publications), followed by reptiles (310), birds (300) and amphibians (5). We identified 17 species for which there were no significant publications, suggesting little attention has been given to these species. We highlight three key issues: limited Indonesian authorship, taxonomic bias towards mammals and birds, and a need to address these challenges in authorship and bias. The low number of publications on many Critically Endangered land vertebrates reflects a lack of research effort, mostly because of limited funds and unequal conservation attention.
Effort is a ubiquitous feature in the decision-making literature. Increasing numbers of studies examine the effect of effort requirements on behavior using a discounting framework, assessing the process by which the subjective value of an outcome decreases as the effort required to obtain it increases. Therefore, a review of methodological approaches, findings, and issues is timely. Accordingly, in this systematic review, we identified research studies examining effort discounting to explore how choice architecture factors used in delay discounting and other experimental manipulations affected effort discounting, and the mathematical descriptors used to summarize the relationship between subjective value and effort requirements. Our analysis suggests an area ripe for future research and identifies important knowledge gaps. These gaps are attributable to the use of divergent definitions of effort, as well as highly heterogeneous methodologies, which limit our ability to generate strong conclusions about the intersection between effort and delay discounting processes.