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Volume
7: No. 6, November 2010
SYSTEMATIC REVIEW
Quality of Systematic Reviews of Observational Nontherapeutic Studies
This flow chart shows 3 boxes. The top box reads
Total references — 1,053
- Medline via PubMed — 904
- Related publications — 14
- WorldCat — 2
- Scirus — 28
- Manual search — 70
- Guidelines, textbooks, consensus statements — 23
- Published by the authors — 11
- Cochrane Library — 1
It is connected by a vertical line to 2 additional boxes. The left box
reads
Included studies — 397
- Systematic reviews for the present article — 145
- Tools (scales and checklists) — 96
- Working groups — 13
- Methodologic studies about bias in observational research — 143
The right box reads
Excluded studies — 656
- Ethical guidelines — 3
- Reviews — 23
- Centers for Disease Control and Prevention study — 4
- Related to interventions — 209
- Related to diagnostic studies — 54
- Not relevant to research questions — 363
Figure. Study flow to identify systematic reviews
of observational studies, scales and checklists for planned, formal internal quality
evaluation, and studies about bias in observational research.
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