Systematic Review
A structured synthesis of all available evidence on a specific research question, using predefined criteria to identify, evaluate, and summarize studies.
In Depth
Systematic reviews are considered the highest level of evidence in evidence-based medicine when they synthesize multiple high-quality RCTs. Key databases for cannabis systematic reviews include PubMed, Cochrane Library, and EMBASE. The Cochrane Collaboration has published systematic reviews on cannabinoids for multiple sclerosis, chronic pain, and chemotherapy-induced nausea. Quality is assessed using tools like GRADE (Grading of Recommendations Assessment, Development and Evaluation).
Related Terms
Further Reading
More in Research Methods
Randomized Controlled Trial (RCT)
The gold standard study design in clinical research. Participants are randomly assigned to treatment or control groups to minimize bias and establish causation.
Meta-Analysis
A statistical technique that combines quantitative data from multiple studies to produce a pooled estimate of effect size with greater statistical power than any individual study.
Placebo-Controlled
A study design in which the control group receives an inert substance (placebo) identical in appearance to the active treatment, to account for the placebo effect.
Observational Study
A study in which researchers observe participants without intervening. Includes cohort studies, case-control studies, and cross-sectional surveys.
Bioavailability
The fraction of an administered dose that reaches systemic circulation in an active form. Varies substantially by route of administration for cannabinoids.