What this is: A randomized controlled trial in people, the strongest single-study design. One trial is not proof; check who was studied and what it was compared against in the source.
What this is: A meta-analysis that pools earlier studies. It is only as strong as the studies it includes.
What this is: A meta-analysis that pools earlier studies. It is only as strong as the studies it includes.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A systematic review that summarizes earlier studies using a stated search method. It adds no new data.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A report on a single patient. It can flag a possible signal but cannot show cause and effect.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A preprint, shared before peer review. Treat its findings as provisional.
What this is: A guideline or consensus statement from an expert group. It is expert opinion, not new data, and may reflect one country's practice.
What this is: A randomized controlled trial in people, the strongest single-study design. One trial is not proof; check who was studied and what it was compared against in the source.
What this is: A study in people that was not randomized. It cannot rule out other explanations.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: An editorial, letter or commentary. It is expert opinion, not new data.
What this is: An editorial, letter or commentary. It is expert opinion, not new data.
What this is: An editorial, letter or commentary. It is expert opinion, not new data.
What this is: A randomized controlled trial in people, the strongest single-study design. One trial is not proof; check who was studied and what it was compared against in the source.
What this is: A randomized controlled trial in people, the strongest single-study design. One trial is not proof; check who was studied and what it was compared against in the source.
What this is: A later analysis of data from a randomized trial, looking at questions the trial was not designed to answer. Treat it as hypothesis-generating.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A trial registered on ClinicalTrials.gov: a record of a planned or running study. No results are posted. A registration is not evidence that anything works.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A randomized controlled trial in people, the strongest single-study design. One trial is not proof; check who was studied and what it was compared against in the source.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A laboratory study in cells or lab models. Results in these models often do not carry over to humans.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.
What this is: A study in people that was not randomized. It cannot rule out other explanations.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A review that summarizes earlier studies. It adds no new data, and its strength depends on the studies it covers.
What this is: A report on a single patient. It can flag a possible signal but cannot show cause and effect.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.
What this is: A laboratory study in animals. Results in these models often do not carry over to humans.