title: A controlled analysis of authorship trends over two decades.
abstract: OBJECTIVE
  The purpose was to assess authorship trends over time by taking account of publication type and controlling for number of investigating centers and funding status in a multivariable analysis.
  
  
  METHODS
  A database of 403 randomized studies and 193 controlled observational studies was assembled by means of a combination of electronic and hand search of 4 generic obstetrics and gynecology journals for the years 1975, 1980, 1985, 1990, and 1995. A multivariable logistic regression model was built for evaluating the effect of time on authorship with multiauthored articles as the binary outcome variable (articles were classified as either those with <6 authors or those with >/=6). The analysis was performed separately for the 2 types of publications, and it was adjusted for the confounding effects of number of centers, funding status, and journal of publication. The beta coefficient (and its exponent) associated with the time term in the logistic model provided a measure of the trend in publication of multiauthored articles.
  
  
  RESULTS
  In randomized studies the odds of publishing a multiauthored article, given the number of centers, funding status, and journal, were increased on average by 6% with every 5-year increment in time (odds ratio, 1.06; 95% confidence interval, 1.02-1. 10; P =.007). Similarly, in controlled observational studies, there was a 10% increase in the odds of publishing multiauthored articles (odds ratio, 1.10; 95% confidence interval, 1.01-1.20; P =.03).
  
  
  CONCLUSIONS
  There is an inflationary trend in authorship that is not explained solely by the increased collaboration between centers and funding for research.
authors.affiliation: Department of Obstetrics and Gynecology, Birmingham Women's Hospital, Dundee, United Kingdom.
authors.forename: K S
authors.initials: KS
authors.lastname: Khan
authors.forename: C R
authors.initials: CR
authors.lastname: Nwosu
authors.forename: S F
authors.initials: SF
authors.lastname: Khan
authors.forename: L S
authors.initials: LS
authors.lastname: Dwarakanath
authors.forename: P F
authors.initials: PF
authors.lastname: Chien
mesh_terms: D001319:Authorship; D006176:Gynecology; D016015:Logistic Models; D009774:Obstetrics; D010506:Periodicals as Topic; D011643:Publishing / Q000639:trends; D016032:Randomized Controlled Trials as Topic; D012109:Research Support as Topic