Overall Distribution
Classification priority: PubMed MeSH publication-type tags (most reliable, covers ~65–70 % of the corpus) → OpenAlex work type → title-keyword heuristics. Papers without a detectable study design are classified as Other.
Trends Over Time (2000–2024)
Annual paper counts by study type (2000–2024).
Summary Table
| Study type | Papers | % | Citations |
|---|---|---|---|
| Other | 654 | 76.6% | 22,962 |
| Review | 107 | 12.5% | 10,225 |
| RCT | 68 | 8.0% | 4,257 |
| Observational | 19 | 2.2% | 1,995 |
| Systematic Review / Meta-analysis | 4 | 0.5% | 26 |
| Clinical Trial | 2 | 0.2% | 6 |