Please feel free to find more details (e.g., the stringent criteria used to create this database) and more statistics data via this publication: Ma J, et al., O-GlcNAcAtlas: A database of experimentally identified O-GlcNAc sites and proteins. Glycobiology. 2021, 31, 7, 719-723, DOI: 10.1093/glycob/cwab003.