We decided not to report the results from PsycINFO in our search because this database, even more than MEDLINE, appears to have undergone substantial changes regarding the journals it includes. We generated a plot from the PsycINFO database of all articles, chapters, and such that were indexed per year. The resulting plot was scalloped in shape. There were years of clear growth, followed by a sudden drop, followed by more growth. In contrast, the plot of total number of articles on MEDLINE per year showed little deviation from a straight line. To us, this result suggests that the PsycINFO database has undergone major changes in the journals it was indexing, especially in the late 1970s and mid-1980s.