Table 4.

Details about authors’ collaborations.

Collaboration measure	Overall time period: 2020-2021	2020	2021
Single-authored documents, n	13,794	10,324	3470
Documents per author, n	0.321	0.312	0.202
Authors-per-document indexa	3.11	3.21	4.95
Coauthors per document, n	7.15	6.86	7.78
Collaboration indexb	3.43	3.57	5.37

^aThe authors-per-document index was calculated by dividing the total number of authors by the total number of articles.

^bThe collaboration index was calculated by multiplying the total number of authors on multiauthored documents by the total number of multiauthored documents [26].