The methods section of a medical research paper is where you describe in detail how your study was planned and conducted. This section allows readers to evaluate the appropriateness of your methods and procedures, and to assess whether they were properly applied. It also permits other researchers to replicate your study if needed.
The methods section should provide enough information to allow other researchers in your field to understand how you arrived at your results and conclusions. It should describe your study design, setting, participants, interventions, measurements, and data analysis plan. The level of detail will depend on the complexity of your study, but generally you want to provide enough details that another researcher could essentially repeat your study based on the information given.
Overall Structure
The structure of the methods section will depend on the type of study being conducted, but it typically includes the following main subsections:
Study Design
Briefly state the overall design of your study, such as whether it was an observational study, randomized controlled trial, case-control study, cohort study, systematic review, meta-analysis, etc. Provide a brief justification for your chosen design based on your research question/hypothesis.
Setting
Describe where the study was conducted, such as the specific hospital, clinics, labs, or other settings involved. Provide details about geographic location, community type (urban, rural, etc.), availability of resources, and any relevant characteristics of the setting that could impact the study.
Participants/Subjects
Describe eligibility criteria and the process of selecting and recruiting participants. Include information on inclusion and exclusion criteria. Provide details on the number of participants enrolled and any subgroups analyzed. Describe any incentives offered. You may also discuss characteristics of participants such as demographics, disease severity, medications, etc. relevant to your study.
Interventions
If the study involved experimental interventions, describe each intervention in detail, including dosage, administration method and schedule, delivery mechanism, concomitant medications permitted/prohibited, and anything else needed to fully understand the intervention. Explain how interventions were assigned to participants.
Measurements/Variables
Describe each variable or measurement collected, how it was defined and measured, the instruments/tools/questionnaires used, and procedures followed to collect the data. Discuss issues related to reliability and validity if appropriate. If subgroups or secondary outcomes were examined, indicate this here.
Data Analysis
Describe your plan for statistical analysis of the data in relation to each study objective and hypothesis. Specify the statistical tests used and planned comparisons. Discuss handling of any missing or abnormal data. Define your approach for determining statistical significance.
To enhance flow and readability, you may break the methods section into logical subsections using relevant headings like “Participant Recruitment”, “Procedure”, “Outcome Measures”, etc. Present methods in past tense, except when describing an ongoing aspect of the study. Use subheadings to clearly separate distinct study components and procedures.
Language and Tone
Use precise and specific language to eliminate ambiguity. Avoid medical jargon that may not be clear to all readers. Define any technical terms on first use. Use the active rather than the passive voice when possible (e.g., “We screened participants…” rather than “Participants were screened…”). Maintain an objective, matter-of-fact tone throughout without emphasizing results or conclusions.
Details to Include
Provide specifics on sample size calculations, power analyses, randomization and blinding techniques, eligibility assessment tools, data collection tools with references/references for validity and reliability, detailed procedures followed, data management and quality control processes, specifics on data analysis plan etc. as appropriate for your study type.
Use consistent terminology when referring to similar concepts (e.g. consistently call your participant group either “subjects” or “participants”). Provide relevant protocol registration numbers for clinical trials. Reference related published methodology standards or guidelines that informed your methods where applicable.
If deviations from original study protocol occurred, acknowledge and justify them. Discuss procedures for handling adverse events and protocol violations. Acknowledge sources of support and funding as required by journals. Follow the manuscript formatting and style guidelines of the target journal.
Peer Review Considerations
Reviewers will look for clear descriptions of the study design rationale, intervention and comparison groups, outcomes evaluated, participant inclusion/exclusion criteria, sample size calculations, randomization and blinding methods, data collection and management procedures, statistical analyses plan and how it relates to the research question/objectives. They will also check that proper ethical approval was obtained where required.
Omitting important details, using vague language or terminology inconsistently could undermine the methods description and conclusions. Clearly stating any limitations, challenges or deviations from planned methodology upfront also enhances credibility. Taking time to ensure methods are logically organized and written in a direct, explicit style will facilitate understanding and evaluation of the study.
Thoroughly yet concisely describing your study methods allows readers to critically assess the quality and validity of your research. Crafting this section with clarity, precision and necessary details is key to effectively communicating your methodology and setting the stage for transparent evaluation and interpretation of findings. Following general reporting guidelines will help ensure all essential aspects are covered to standard.
Andrew Stroud