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Introduction: Gender inequality exists in scientific publications. The aim of this study was to determine changing patterns in gender differences and factors associated with the positioning of authors' names in original articles published in Archivos de Bronconeumología (AB)., Methods: We performed a bibliometric study of articles published in AB between 2001 and 2018. Author gender was analysed in four scenarios: first author, last author, middle authors, and mentee authors. Comparisons were made by authors' specialties, funding received, multicentre studies, specialist areas, and others. Multivariate models adjusted for the percentage of registered physicians in the Spanish health system were created to predict the female gender of the first, middle, and last author., Results: A total of 828 publications were analysed in which women appeared as first authors in 286 (34.5%) and last authors in 169 (20.4%). A gradual increase in women as first authors was observed (P = .0001), but not as last authors (P = .570). Overall, the average number of female authors increased over time (from 1.6 ± 1.4 in 2001-2005 to 3.3 ± 2.3 in 2016-2018, P = .0001), with no differences in male averages. The adjusted multivariate models reflected a positive bi-directional relationship between the first author and the middle authors, and a negative association between the first author being Spanish and the last author being female (OR 0.57; 95% CI 0.36-0.88, P = .012)., Conclusions: Gender differences were found in various aspects of authorship in AB, summarized by a greater participation of women as first and intermediate authors, but not as last authors., (Copyright © 2020 SEPAR. Publicado por Elsevier España, S.L.U. All rights reserved.)