Table 3.
Association between characteristics of index meta-analysis and possibility for redundancy in a topic
| Characteristic | Topics with redundancy/total No of topics | Fisher’s exact P value |
|---|---|---|
| Cochrane review: | ||
| Yes | 15/27 | 0.09 |
| No | 34/46 | |
| Type of condition: | ||
| Cardiovascular diseases | 12/14 | 0.33 |
| Gastroenterology | 6/9 | |
| Neurology | 7/8 | |
| Hematology/oncology | 3/7 | |
| Psychiatry | 4/6 | |
| Pulmonary diseases | 4/5 | |
| Surgery | 3/5 | |
| Obstetrics and gynecology | 2/5 | |
| Other | 8/14 | |
| Type of intervention: | ||
| Drugs and biologics | 33/49 | 0.42 |
| Surgical and interventional | 10/12 | |
| Behavioral/psychological | 2/5 | |
| Physical therapy | 3/5 | |
| Other | 1/2 | |
| Country of origin: | ||
| United Kingdom | 12/18 | 0.71 |
| United States | 5/11 | |
| Canada | 7/8 | |
| China | 5/7 | |
| Australia | 3/5 | |
| Other | 17/24 | |
CDSR=Cochrane Database of Systematic Reviews.