Why Systematic Reviews Have the Highest Evidence Level
Systematic reviews and meta-analyses sit at the top of the evidence hierarchy. By rigorously synthesizing all available studies, they provide the most reliable estimate of an effect.
PRISMA Flow Diagram
PRISMA 2020 documents how many records were identified, screened, and included ā ensuring transparency and reproducibility.
Key Statistical Concepts
- Pooled effect size: SMD, Risk Ratio, Odds Ratio depending on outcome type.
- Heterogeneity (IĀ²): IĀ²>50% ā use random effects model.
- Forest plot: Visualizes each study's effect size and the pooled estimate.
- Funnel plot: Detects publication bias.
Boss Statistics Meta-Analysis Service
We support protocol development, data extraction, statistical analysis, and PRISMA-compliant reporting.