One of the elements that have a recognized weight in studies on the distribution of citations and their behavior in different documentary typologies and disciplines is non-citation, an element that is also affected by time (half-life, aging of citations, etc.). All these facts have been studied profusely for years, and from very different perspectives, but little has been done in the framework of scientific monographs despite being an area in which criticisms of evaluation systems continue to appear. This work aims to study the evolution of non-citation in monographs analyzing the results of previous works; for this, the studies of Rong Tang (2008) and Jeppe Nicolaisen and Tove Faber Frandsen (2019) are taken, and, after the necessary normalizations, replications of steps and data treatment, they are comparatively analyzed from the point of view of said evolution. The results suggest a relationship between the non-citation ratios and the document typology, allowing a better understanding of the current panorama of the publication and use of scientific information, and making the non-citation ratio an interesting indicator to measure the varying impact of scientific monographs. [ABSTRACT FROM AUTHOR]