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Table 5 Ranking top 10 highly productive institutions that most frequently published articles associated khat worldwide

From: Bibliometric analysis on global Catha edulis (khat) research production during the period of 1952–2014

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)

  1. SCR standard competition ranking, KSA The Kingdom of Saudi Arabia, UK The United Kingdom
  2. aEqual institutions have the same ranking number, which leaves a gap in the ranking numbers