Table 5.
Classification of retrievable references.
| Types of reference | Valid (n) | Invalid (n) |
|---|---|---|
| *Research article | 75 | 15 |
| Review article | 5 | — |
| Meta-analysis | — | — |
| Preclinical studies | ||
| Animal studies | — | — |
| In vitro studies | — | 1 |
| Book | — | 1 |
| Website | 2 | — |
| Data on file | — | — |
| **Other journal articles | 2 | 1 |
| ***Other references | 8 | 1 |
|
| ||
| Total retrievable references = 111 | 92 | 19 |
*Research article includes randomized controlled trials, randomized placebo controlled trials, nonrandomized trials, clinical trials without details of design, observational studies without details of design, retrospective studies, case-control studies, and postmarketing surveillance studies.
**Other journal articles: case report, correspondence article, editorial, and letter to the editor.
***Other references: conference proceedings, report, departmental study, therapeutic guidelines, newspaper article, health magazine article, unpublished trial or surveillance data, online medicine prescription information, physicians' desk reference, pharma-aid, and reference with vague description.
n: Number of references.