Expansion of information in scientific research papers

Presenting information in papers allows readers to see the evidence for the research claims. The amount of information presented to readers is increasing in high impact factor scientific journals. The aim of the present study was to determine whether there was a similar expansion in the amount of information presented to readers in subject-specific journals. We examined 878 research papers that were published in the journals Biology of Reproduction and Reproduction during the first six months of 1989, 1999, 2009, and 2019. Although there were few differences between the journals, we found that between 1989 and 2019 the number of figures increased 1.5-fold, the number of figure panels increased 3.6-fold, and the number of display items increased 5.6-fold. Amongst the display items, the number of images per paper increased 10-fold, and the number of graphs per paper increased 3.7-fold. The median paper in 1989 was 8 pages long, contained 6 tables and/or figures, with 1 image and 4 graphs. In 2019 the median paper was 12 pages long, contained 7 tables and/or figures, with 13 images and 15 graphs. This expansion of information in subject-specific journals implies that authors, reviewers, and editors need to help readers digest complex biological messages without causing information overload