Table 5.
Ranking top 10 highly productive institutions that most frequently published articles associated khat worldwide
| SCRa | Institution, country | No. of documents (%) |
|---|---|---|
| 1st | Sana’a University, Yemen | 52 (8.0) |
| 2nd | Addis Ababa University, Ethiopia | 29 (4.5) |
| 3rd | King Saud University, KSA | 26 (4.0) |
| 4th | University of Nairobi, Kenya | 20 (3.1) |
| 4th | Universite de Geneve, Switzerland | 20 (3.1) |
| 6th | University of Minnesota, USA | 19 (2.9) |
| 7th | Jazan University, KSA | 15 (2.3) |
| 8th | University of Nottingham, UK | 14 (2.2) |
| 9th | Jimma University, Ethiopia | 12 (1.8) |
| 10th | University of Kent, UK | 10 (1.5) |
| 10th | Universitat Bern, Switzerland | 10 (1.5) |
SCR standard competition ranking, KSA The Kingdom of Saudi Arabia, UK The United Kingdom
aEqual institutions have the same ranking number, which leaves a gap in the ranking numbers