Scholarly disciplines differ in their publication practices. Disciplines differ in publication practices in many ways. Differences can be found, for example, in publication types, publishing frequency, the number of co-authored publications as well as the number and age of references used. The number of researchers working in individual disciplines also varies. These differences affect, for example, the number of publications and citations received, and they are also reflected in publication metrics indicators. When using publication metrics, it is important to consider these differences. For example, the number of publications by units active in different disciplines are not directly comparable. The coverage of databases varies between disciplines. The database used affects the values produced by indicators, and indicators obtained from different databases are not comparable.