Trends in Gender Authorship and Collaborations: A 30-Year Comparative Bibliometric Analysis of Manuscripts from The Journal of Bone and Joint Surgery and The Bone and Joint Journal

Table 1

Bibliometric analyses by journal and geographical region.

	JBJS					BJJ
	North America (n = 758)	Europe (n = 158)	Asia (n = 61)	Australia/New Zealand (n = 10)	value	North America (n = 128)	Europe (n = 587)	Asia (n = 118)	Australia/New Zealand (n = 49)	value
Author no.	4.4 ± 2.4	4.9 ± 2.4	5.4 ± 1.7	5.8 ± 2.6	0.000009	4.3 ± 2.1	4.2 ± 2.1	4.8 ± 1.9	4.2 ± 1.9	0.004
No. of institutions	2.2 ± 1.9	2.3 ± 2.0	2.1 ± 1.3	3.5 ± 2.8	0.28	2.1 ± 1.4	2.9 ± 1.4	1.9 ± 1.2	2.2 ± 1.5	0.44
No. of countries	1.1 ± 0.5	1.4 ± 1.0	1.1 ± 0.2	1.7 ± 0.7	<10^−6	1.2 ± 0.5	1.2 ± 0.5	1.1 ± 0.3	1.2 ± 0.5	0.072
No. of citations (normalized)	4.44 ± 5.04	5.67 ± 6.67	3.18 ± 3.51	4.67 ± 5.53	0.083	3.48 ± 3.67	3.20 ± 3.63	1.90 ± 1.92	3.49 ± 3.47	0.0003
No. of references	31.0 ± 23.6	30.5 ± 16.8	24.7 ± 11.3	34.6 ± 24.2	0.24	30.5 ± 17.1	24.8 ± 18.6	25.3 ± 16.3	26.5 ± 16.2	0.0001
No. of pages	7.9 ± 3.0	7.9 ± 2.4	7.8 ± 2.2	9.4 ± 0.8	0.15	5.5 ± 1.7	5.4 ± 2.0	5.7 ± 1.9	5.7 ± 2.0	0.28
Corresponding author position (standardized)	0.45 ± 0.33	0.37 ± 0.30	0.40 ± 0.32	0.56 ± 0.43	0.046	0.50 ± 0.32	0.42 ± 0.29	0.41 ± 0.30	0.54 ± 0.35	0.009

Values are mean ± 1 standard deviation.