PubMed classification 202302

The classification contains about 20 million PubMed publications from 1995 onward. It has been created using clustering in a citation network. 
The February 2023 update is a complete new version of the classification based on new clustering and labeling.
File description
PMID_cluster_relation_[date].csv contains the relation between PMIDs and clusters. Four levels are included:

Level 1 - Topics - Most granular
Level 2 - Specialties
Level 3 - Disciplines
Level 4 - Discipline group - Most coarse

Labels
For each level there is a table with labels (e.g. labels_lev1_[date].csv), related by an id (e.g lev1_cluster_id).
Stats
For each level there is a table with statistics (e.g. lev1_stats). The table includes the columns below. For more information about the "Clinical", "Human", "Animal" and "Molecular/Cellular Biology" categories, see https://nih.figshare.com/collections/iCite_Database_Snapshots_NIH_Open_Citation_Collection_/4586573

p - The number of publications in the cluster in the initial clustering. 
pct_clinical - The proportion of clinical articles  
sum_clinical - The number of clinical articles 
pct_human - The average of the fraction of MeSH terms that are in the "Human" category 
sum_human - The sum of fraction of MeSH terms that are in the "Human" category 
pct_animal - The average of the fraction of MeSH terms that are in the "Animal" category 
sum_animal - The sum of fraction of MeSH terms that are in the "Animal" category 
pct_molecular_cellular - The average of the fraction of MeSH terms that are in the "Molecular/Cellular Biology" category 
sum_molecular_cellular - The sum of fraction of MeSH terms that are in the "Molecular/Cellular Biology" category

Added publications
Added_pubs_version_[nih occ version].csv contains the same information as above, but for publications that have been assigned to clusters after the initial clustering proceedure.  
Visualizations:

Base map of PubMed 2010-2022
Map of PubMed 2022 - Including hyperlinks to publications
Map colored by % Clinical
Map colored by % Human
Map colored by % Animal<br>
Map colored by % Molecular/Cellular

See the figshare collection for further description.