Best Systematic Review and Meta Analysis Writing Services for Researchers: A Complete Guide
Systematic Review and Meta Analysis writing services are a great opportunity to learn about various research methods, research designs and how data is managed. This requires setting goals, objectives and consistently meeting them.
Integration of evidence is synonymous to a meta analysis. Evidence, in this case, constitutes a body of studies. To locate a study, it is necessary to set criteria.
Learning the above methods helps in writing different types of research documents including research articles and research proposals among others.
Systematic Review and Meta Analysis Services consists of searching, appraising, and integrating evidence to answer a query. It helps identify evidence, agreements and evidence, and disagreements.
What is a Systematic Review?
It is seeking and assessing studies to integrate into a particular area of research.
The PRISMA standards include a 27-item checklist. It is widely believed that the following of all 27 PRISMA items constitutes a complete and sound methodology for a systematic review.
It would be more appropriate to synthesize evidence on a topic and to integrate evidence on a topic.
We will look at several clinical trials to evaluate the effects of the same intervention on reducing blood pressure. Considering the nature of a randomized control trial, it is expected that results will differ. However, with respect to evidence synthesis, a group of studies with differing results may be appropriate for comparing and pooling in order to determine the overall effect of the intervention and to interpret the variations in the results.
To justify a synthesis of studies, there should be similarities among the participants, the interventions, the outcomes and the study methods.
There are different types of meta-analysis including clinical trial meta-analysis, public health/epidiomology/policy meta-analysis, health services/health economics meta-analysis, social science meta-analysis, and other types of meta-analysis.
The results of different types of clinical trials may be synthesized including randomized clinical trials, non-randomized/quasi-randomized clinical trials, health services research, outcomes research, etc.
2. Meta-analysis of observational studies
If multiple studies of the same research question are available in the form of case-control and/or cohort studies and/or cross sectional studies, they may be combined in a meta-analysis.
3. Meta-analysis of diagnostic tests
There may be a meta-analysis to determine the agreement on the estimates of the sensitivity and specificity of diagnostic tests.
4. Prevalence Meta-analysis
Prevalence estimates may be combined if the studies are similar enough.
The type of outcomes measured and the research question will inform the types of statistical methods and the ways in which the results will be interpreted.
Systematic reviews and Meta analyses are sometimes paired and at other times, distinct elements of research synthesis.
Systematic Review vs Meta Analysis: What Is the Difference?
Although these terms are often used together, they describe different aspects of evidence synthesis.
| Feature | Systematic Review | Meta-Analysis |
|---|---|---|
| Main purpose | Systematically identify and synthesise relevant evidence | Statistically combine compatible study results |
| Literature search | A central component | Usually conducted within a systematic review |
| Study selection | Based on predefined eligibility criteria | Uses eligible studies with suitable data for quantitative synthesis |
| Data analysis | May be narrative or quantitative | Uses statistical methods |
| Results | Summary of the available evidence | Pooled estimates, uncertainty intervals and related statistics |
| Is it always required? | Depends on the research objective | No; it is appropriate only when justified by the data |
A systematic review can be performed without meta-analysis. However, for a meta-analysis to be performed, a thorough and systematic process of identifying and evaluating studies is a must.
What drives the need for systematic review and meta-analysis support?
Researchers face numerous challenges in conducting synthesis of research evidence. For example, they may encounter challenges related to management of large datasets, analysis of complicated statistical methods, and explaining their findings.
Research support may address the challenges stated without compromising the researcher’s role in making scientific decisions and drawing final conclusions.
Questions in research are usually framed in the PICO format.
- P = Population
- I = Intervention
- C = Comparison
- O = Outcome
To illustrate, a researcher might want to study the effects of a given exercise intervention in improving glycaemic control compared to standard care among adults with Type 2 Diabetes.
A specific research question focuses the search of the databases, limits the search results, determines the studies to include in the review, guides data extraction, and identifies the statistical methods to be used in the analysis.
2. Conducting a Thorough Literature Search
Finding relevant studies for inclusion in a Systematic review and meta analysis writing services is arguably the most difficult and time consuming part of a review. A search strategy that is too narrow will miss evidence, and a search strategy that is too broad will generate an unwieldy number of results.
Some of the major research databases include:
- PubMed/Medline
- Embase
- Scopus
- Web of Knowledge
- Cochrane Library
- CINAHL for specific nursing and allied health research
The choice of research database is contingent upon the research topic and the resources available to the researcher. Search terms and strategies should be documented in a way that the process can be repeated.
It is more useful to search for the correct number of papers than to search for a large number of papers.
3. Screening and Selecting Studies
After the search has been conducted, the researcher must remove any duplicates found in the results. The remaining results must be evaluated to determine if they should be included in the research.
Assessing Eligibility
There are two steps to evaluate eligibility.
In the first step, the researcher must review the title and abstract of the results and determine if they may be eligible for inclusion.
In the second step, if eligibility is unclear from the review of the title and abstract of the study, the researcher must review the entire study to determine eligibility.
Assessing the Full Text of Potentially Eligible Studies
Two reviewers must independently assess the full text of studies for eligibility, if possible. Discrepancies must be resolved by a third reviewer. The reasons for excluding a study must be documented. This helps researchers understand why studies were excluded and aids the understanding of the final evidence base for the research.
4. Extracting and Organizing Data
The relevant information from the studies must be captured in a standardized format. This information may include author and publication year, study design and location, participant characteristics, intervention and comparison groups, sample size and follow-up period, outcomes, and funding and limitations of the study.
There are structured extraction forms. The use of these forms decreases inconsistencies and helps researchers double check the information. It is important that researchers verify the information and check the numbers against the original sources, rather than relying on summaries.
Assessing Risk of Bias
Publications don’t always represent reliable evidence due to limitations in participant selection, missing data, inadequate measurement, confounding and bias in the report.
Which risk of bias tool to use depends on the study design. For example, the risk of bias 2 tool and the risk of bias in non-randomized studies tools are appropriate for evaluating bias for randomized and non-randomized studies, respectively.
Performing Statistical Analysis
In the context of evidence synthesis, various models to integrate the findings of different studies are used. There are different ways to evaluate heterogeneity.
Several methods may be appropriate in a given case.
Preparing a Clear Research Manuscript
Ratios and odds ratios may be reported using forest plots. Differences in means may be plotted on a scatter plot, and time-to-event may be plotted using a survivor curve. The impact of each study may be assessed by sensitivity analysis and the influence of different methods and choices may be assessed by meta-regression.
The overall conclusions of a given review may be succinctly presented in a research manuscript using different study outcomes and study design-specific elements of EBM such as tables, forest plots and PRISMA flow diagrams.
The findings need to be interpreted in the discussion. The conclusions should not state the findings in an overstated manner in terms of their implications and their generalisability to other situations.
Eligible reviews can register a prospective protocol in an appropriate registry such as PROSPERO, subject to current eligibility criteria of the registry.
Search Strategy and Literature Management
This may involve development of database specific search strategies, referencing, identifying and managing duplicates and documenting the search strategy.
Each database has a unique way of representing search strategies. Final search strategies need to be adapted to different databases.
Study Selection and Data Extraction
Training is available for configuration of workflows for extraction, templates and organizational aids for research data.
Researchers need to adhere to the approved protocol to make study eligibility decisions. Researchers have to evaluate and interpret the rationale for inclusion and exclusion of studies.
Statistical and Methodological Support
This involves understanding and interpreting the results of quantitative synthesis and having confidence in results and conclusions.
Narrative Synthesis needs to be considered when evidence precludes quantitative synthesis.
Manuscript Editing and Publication Preparation
This involves structure, language, editing for clarity, and completeness of the manuscript, and conforming to reporting guidelines.
Writing support should not involve fabrication of data, results or citations.
Authors should review and assess results to check accuracy.
When evaluating Systematic Review and Meta Analysis Support services in India, the quality and transparency of the process should take precedence over marketing claims.
Examine the Provider’s Research Background
Learn about the provider’s research background or published work in your area of interest (e.g., systematic reviews, evidence syntheses, biostatistics, etc.). Research experience in the fields of medicine and public health may not be the same as other research disciplines.
Ask the provider how he or she would go about answering your question, as opposed to asking general service-related questions.
Examine the Proposed Methodology
Determine if the methodology describes how the researcher will search for evidence, screen the evidence, extract data, and assess bias.
If a meta-analysis is proposed, determine how the researcher intends to synthesize the data and how the heterogeneity across the studies will be handled.
Know What You Will Receive
Ask what you will receive. Ensure that the deliverables are agreed upon, as these may include a search strategy, rationale, tables or figures, manuscripts, and/or edited manuscripts.
Recognize What Will Be Required of You
Know the activities that will be required of you. Acknowledge what activities will require additional effort and/or what will determine the outcomes of the research (i.e., what methodological decisions will be made).
Choose a Service that Embodies Your Values
Prioritize research integrity, transparency and the reproducibility of research.
Best Quality at Fair Cost
Select a company that provides methodological review and data verification and/or statistics as required based on the project.
Work scope and experience should be considered before choosing the company.
Best Thesis writing services play a major role in conducting medical and academic research.
Sometimes a researcher has to do a thesis and a systematic review at the same time, and that is where Thesis writing services are helpful to a researcher by giving him/her legitimate academic support on structure, language, style, citation, research methodology and presentation.
For postgraduate medical students who are doing an MD or DNB, a systematic review may be part of their dissertation, an independent article, or the background for a clinical research project.
However, the requirements of a thesis vary from university to university and from program to program. The student should verify with his/her university regarding this before outsourcing any part of his/her research work.
This service may include:
- clarifying research questions and objectives,
- restructuring the literature review to have a logical flow and organization,
- reviewing to ensure consistency of methodology and results,
- editing academic writings and reformatting,
- reviewing tables and references,
- explaining statistical data and outputs,
- learning about research methodology and studying design.
It is the responsibility of the researcher or student to understand how the data are analyzed and generated and if there are any methodological issues. The researcher or student must comply with his/her university’s or institution’s policy regarding assistance, guidance and disclosure.
Common Problems in Systematic Reviews and Meta-Analyses
Recognizing these problems helps expedite the review process.
One example is an incomplete search strategy.
A practical solution is to refine the search strategy by adding limits based on the research question, and test it against studies that are already known to be relevant. Document the entire search strategy.
Inconsistent eligibility decisions
The problem is that various members of the review team may make different decisions about the same studies.
A practical solution is to create and document a set of eligibility rules, and standardize a process for resolving disagreements.
Incomplete or inconsistent outcome data
Problem: Studies may not report outcome data or use varied methods for outcome data reporting.
A practical solution is to collect and summarize all the data that is reported, and determine what data is missing to answer the clinical question. If contacting the study authors is appropriate, ask them to provide the missing data.
High heterogeneity among the included studies
Problem: There are differences among studies (population, study setting, study design, and study interventions) within the same review.
Practical solution is to identify if the differences are due to bias or methodological shortcomings. Justify the rationale for the boundaries within which studies are considered for the review.
Overstating the Findings
Problem: Authors often regard a significant pooled estimate as sufficient evidence that an intervention is effective in the overall population.
Practical Solution: Evaluate confidence intervals, risk of bias, consistency of results, applicability and overall impact of the evidence. Address and explain uncertainty, rather than making assertions beyond the evidence.
How Long Does a Systematic Review or Meta Analysis Take?
There is no universal timeline. The duration of a review depends upon the complexity of the research question, the number of records, the availability of full texts, the number of reviewers, and the quality and the analytical needs of the data.
Generally, a review involving multiple outcomes is more time-consuming than a review with a single outcome. Also, a review involving multiple study designs is more time consuming than review with a single study design. The complexity of the statistics may also influence the time required to complete the review.
A practical project plan should consider searching, screening, data extraction, verification and analysis. Agreed upon timelines should be established based on the scope of the work rather than promised without regard to the scope of the work to be completed.
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DR. RAHUL BHARTI
General Physician & Diabetologist
10+ Years Experience
Formerly At
- Apollo Hospital, New Delhi
- G.T.B. Hospital, Delhi
- Rama Hospital, Pilkhuwa, Ghaziabad