Table 4. Multivariate regression analysis based on the specialty of journals.

When the specialty of the journal is taken into account, only the percentage of a journal’s tweets that get retweeted shows a positive correlation with the SJR of a journal.

	Estimate	p-value
Number of Followers	0.152	0.327
Percentage of Retweets	0.441	0.007
Journal Specialty - Cardiothoracic Surgery	0.43	0.11
Journal Specialty - Neurosurgery	0.173	0.576
Journal Specialty - Orthopedic Surgery	-0.173	0.482
Journal Specialty - Plastic Surgery	-0.485	0.151