| Primary | Secondary | Tertiary |
|---|---|---|
| New data, gathered by the author(s) for analysis | Pre-existing data, reexamined and reanalyzed by the author(s) | Pre-existing data from many studies, tabulated by the author(s) for easy reference |
|
Examples -- Clinical Trials Randomized/Controlled Trials Case Studies ***May be either Quantitative or Qualitative*** |
Examples -- Systematic Reviews & Integrative Reviews Meta-Analyses & Meta-Syntheses Literature Reviews Commentary & Criticism |
Examples -- Physicians' Desk Reference CINAHL Evidence-Based Care Sheets |
