How to Write a Strong Scientific Conclusion

A scientific conclusion states what the study's results support, in one to three sentences, in the context of its design and limitations. It must follow from the data and answer the objective.

What it should include

• The answer to the research question.
• The main supporting result in words (not new numbers).
• The scope: for whom and under what conditions.
• A measured statement of limits or the need for confirmation, where relevant.
• If appropriate, the implication for practice or research.

What to avoid

• New findings or arguments.
• Claims of causation from observational designs.
• Statements of efficacy or safety that the sample size cannot support.
• Generic lines such as "further studies are needed" with no specific recommendation.

Method

1. Re-read the objective.
2. Write one sentence that answers it using the primary result.
3. Add one sentence on implications or limits.
4. Compare with the abstract conclusion so they match.

Illustrative example

Invented for teaching. Weak: "Exercise is highly effective and should be given to everyone." Strong: "In this randomised trial of 120 adults with hypertension, a 12-week supervised exercise programme lowered systolic blood pressure by 5 mm Hg compared with usual care; longer-term effects and effects in older adults need testing." (Invented numbers.)

Matching the conclusion to the evidence level

For a randomised trial, you may say that the intervention improved the outcome in the studied population. For an observational study, say that the exposure was associated with the outcome, and mention confounding. For a small pilot or a case report, say that the finding suggests a hypothesis. For a systematic review, refer to the certainty of evidence. Using the correct verb for the design is the quickest way to improve a conclusion.

Common pitfalls

• Overclaiming.
• A conclusion that does not match the abstract.

Key takeaways

• Answer the question, stay within the data, note limits.
• Match the abstract and Discussion.

This page is general educational information about research methods. It is not medical, legal or regulatory advice; follow your institution's ethics board and your target journal's instructions.