Trends in Authorship Characteristics in The American Journal of Sports Medicine,2014 to 2024: A Follow-up Analysis

Abstract

Background:

Authorship patterns in medical journals continue to evolve with expanding team science, academic incentives, and updated authorship guidance. Previous American Journal of Sports Medicine (AJSM) work (1994–2014) reported rising author counts and a growing share of international contributors.

Hypothesis/Purpose:

To update AJSM authorship trends (2014, 2019, 2020, and 2024) and test whether the past decade shows greater mean authors per article, more international and/or academic groups, and a higher proportion of nonphysician first authors.

Study Design:

Cross-sectional bibliometric analysis.

Methods:

We reviewed AJSM articles in 2014, 2019, 2020, and 2024 via the journal archive; editorials, letters, society news, and corrigenda were excluded. For each article, we recorded the first/last author's highest degree and sex, the number of authors, country (United States vs international), and institution type (academic vs nonacademic). Articles with >20 authors were excluded. Differences across years were tested with a chi-square test (Bonferroni-adjusted α = .0083) and a 1-way analysis of variance with the Tukey honest significant difference post hoc test.

Results:

A total of 1482 articles met the inclusion criteria (2014: n = 336; 2019: n = 383; 2020: n = 383; and 2024: n = 380). Article volume did not differ significantly across years (χ²[3] = 4.30; P = .23). From 2014 to 2024, article volume increased by 13.1%. Mean authors per article increased from 5.82 (2014) to 6.47 (2019), 6.55 (2020), and 7.02 (2024) (F[3,1470] = 15.69; P < .0001); all but the 2019 versus 2020 pairwise contrasts were significant. International groups increased from 42.6% (2014) to 51.3% (2024) (χ²[3] = 8.92; P = .03). No pairwise comparison met the Bonferroni threshold (α =.0083); the lowest P value was .0097 (2014 vs 2019). Bachelor of Arts/Bachelor of Science first authorship rose (χ²[3] = 13.78; P = .003), reaching 9% (2020) and 11% (2024). Sex distributions for first and last authors did not change (all P > .05). Twelve articles exceeded the >20-author cutoff and were excluded.

Conclusion:

From 2014 to 2024, AJSM authorship shows expanding team size, increased international participation, and a higher proportion of bachelor’s-level first authors—largely medical trainees—while sex representation remained stable. These patterns underscore the need for transparent contributorship and mentorship to maintain rigor as collaboration intensifies.