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Unified Medical Language System (UMLS)

MSH (MeSH) - Statistics


Semantic Type Distribution

Semantic Type IDSemantic Type NameCount Percentage Distribution
T109Organic Chemical18847632.4
T116Amino Acid, Peptide, or Protein11821820.3
T121Pharmacologic Substance9219015.8
T123Biologically Active Substance6614911.4
T126Enzyme273394.7
T047Disease or Syndrome112721.9
T114Nucleic Acid, Nucleoside, or Nucleotide96531.7
T130Indicator, Reagent, or Diagnostic Aid73451.3
T129Immunologic Factor65371.1

Term Type Counts

Term TypeExpanded FormCount
CEEntry term for a Supplementary Concept266073
NMName of Supplementary Concept242493
PMMachine permutation118135
PCEPreferred entry term for Supplementary Concept72199
ETEntry term61174
MHMain heading28939
PEPPreferred entry term26593
N1Chemical Abstracts Service Type 1 name of a chemical22486
DEVDescriptor entry version16194
DSVDescriptor sort version3923
PXQPreferred qualifier term159
TQTopical qualifier79
QEVQualifier entry version79
QABQualifier abbreviation79
XQAlternate name for a qualifier74
HTHierarchical term22
QSVQualifier sort version7
HSShort or alternate version of hierarchical term4

Attribute Counts

Attribute TypeExpanded FormCount
TERMUITerm unique identifier815918
THMeSH Thesaurus ID - identifies thesauri other than MeSH in which the MeSH heading or cross-reference is included.740033
HMMeSH Heading Mapped To - heading mapped to attribute in C-MeSH containing repeating (MH or MH/SH) elements (e.g. HM = PYRROLIDINONES, HM = *TARTRATES, HM = ESTRONE/* analogs & derivatives)346421
RNRegistry Number - series of numbers and hyphens (any leading zeros in an RN are dropped) or a series of numbers and periods, preceded by EC293643
MDAMeSH date of entry YYYYMMDD - date the term was added to the MeSH file, which is prior to the date the term became available for indexing and searching MEDLARS citations. Terms that have been part of MeSH for many years may have no value in this element.271511
SRCMeSH Literature source of chemical name - a citation to an article in a journal indexed for MEDLINE in which the chemical has been identified. (Note: Not to be confused with source abbreviation of SRC)242823
SCMeSH Supplemental record class.242493
FRMeSH Frequency242456
SOSScope Statement205785
MMRMeSH revision date YYYYMMDD - date of the last major revision to the term's MeSH record.191763
MNMeSH hierarchical number for the concept in the MeSH tree structures. This number also appears in the HCD subelement of the REL and CXT elements.58834
PIMeSH heading or heading/subheading combination(s) followed by a date range in parentheses (YYYY).50390
IIMeSH Indexing Information - for MeSH chemical terms (Term Type=NM), MeSH headings that may be relevant to articles that are also assigned the NM term.44842
RRThe Chemical Abstracts Registry numbers for salts, optical isomers, or isotope-labeled versions of the concept followed by the relationship of this RR to the RN (in parentheses.) Applies to chemicals only. These numbers can be used as links to information in a number of chemical and toxicological databases.36959
DCMeSH Descriptor class - type of MeSH term the concept name represents.28939
DXMeSH Date major descriptor established YYYYMMDD - first day of the Index Medicus publication month in which the descriptor (in any form) was available for searching as a major descriptor.28939
AQLMeSH Allowable Qualifier - list of allowable qualifier abbreviations for MeSH main headings (e.g. AA, CL, CS, DF, DU, IM, I,P ME, PK)27869
HNHistory Note - for MeSH history notes, the year when the current form of the MeSH term was established as a major and/or minor descriptor.24980
PMPublic MeSH note - combines key information from the HN and PI elements in a format that is printed in the MeSH publications.24506
LTIndicates if a chemicals or medical device is a tradename (present in older versions of the Metathesaurus and was discontinued, then brought back starting in 2002AD)15328
ANMeSH Annotation - an informative MeSH note written primarily for indexers or catalogers that may also be useful in explaining the use of a MeSH term to online searchers.14247
PAPharmacologic Action of MeSH main headings (MH) for drugs and supplementary concept names (NM). The information in this element is also represented by an "isa" relationship between the MH or NM concept and the MeSH concept name for the class of drugs with a particular pharmacologic action.13186
FXMeSH MH Mapping - maps a MeSH MH to a 'See Related' MH.8724
OLMeSH Online Note - information helpful to online searchers of MEDLINE, especially when the history of a term or cross-reference has implications for online searching. This is a potential source of useful information for rules for search interface programs.3161
ECSpecifies the MeSH main heading to be used instead of the Descriptor/Qualifier combination specified in the EC_OF attribute.972
DQMeSH Date Qualifier Established YYYYMMDD - date the qualifier became available for indexing MEDLARS citations.79
CXMeSH Consider Also Note - other word roots or prefixes that should be consulted for concepts related to this MeSH concept, e.g., the value for "Heart" is "consider also terms at cardi- and myocardi-".66

Relationship Counts

Relation Name/Additional LabelExpanded FormCount
AQ/Allowed qualifier/Empty relationship attribute605994
QB/can be qualified by./Empty relationship attribute605994
SIB/has sibling relationship in a Metathesaurus source vocabulary./Empty relationship attribute455688
RN/mapped_tohas a narrower relationship/Mapped to346421
RB/mapped_fromhas a broader relationship/Mapped from346421
SY/permuted_term_ofsource asserted synonymy./Permuted term of118135
SY/has_permuted_termsource asserted synonymy./Has permuted term118135
RN/has a narrower relationship/Empty relationship attribute91965
RB/has a broader relationship/Empty relationship attribute91965
PAR/has parent relationship in a Metathesaurus source vocabulary /Empty relationship attribute39400
CHD/has child relationship in a Metathesaurus source vocabulary /Empty relationship attribute39400
RO/mapping_qualifier_ofhas relationship other than synonymous, narrower, or broader/Mapping qualifier of34718
RO/has_mapping_qualifierhas relationship other than synonymous, narrower, or broader/Has mapping qualifier34718
RO/has relationship other than synonymous, narrower, or broader/Empty relationship attribute26832
SY/entry_version_ofsource asserted synonymy./Entry version of16273
SY/has_entry_versionsource asserted synonymy./Has entry version16273
RN/isahas a narrower relationship/Is a13186
RB/inverse_isahas a broader relationship/Inverse is a13186
SY/sort_version_ofsource asserted synonymy./Sort version of3930
SY/has_sort_versionsource asserted synonymy./Has sort version3930
SY/expanded_form_ofsource asserted synonymy./Expanded form of79
SY/has_expanded_formsource asserted synonymy./Has expanded form79

Definition Count

Count
30900

Source Overlap

Source# Concepts Sharing Atom/# Total ConceptsPercentage Distribution
MSHFRE45425/37063212.3
MSHGER41680/37063211.2
MSHCZE39808/37063210.7
MSHITA38885/37063210.5
MSHPOR37466/37063210.1
MSHSPA37162/37063210.0
MSHNOR31310/3706328.4
SNOMEDCT_US29456/3706327.9
MSHPOL28466/3706327.7
MSHRUS28467/3706327.7
MSHSWE28545/3706327.7
SCTSPA28662/3706327.7
NCI27847/3706327.5
MSHFIN24697/3706326.7
MSHJPN24864/3706326.7
CHV24187/3706326.5
MSHDUT20650/3706325.6
SNMI19309/3706325.2
NDFRT16339/3706324.4
RCD15744/3706324.2
CSP10677/3706322.9
SNM10218/3706322.8
LCH_NW10345/3706322.8
MEDCIN8946/3706322.4
MSHSCR8977/3706322.4
RXNORM9045/3706322.4
NCI_FDA8696/3706322.3
OMIM7924/3706322.1
AOD7221/3706321.9
MDRJPN6580/3706321.8
MDR6593/3706321.8
MDRCZE6593/3706321.8
MDRDUT6593/3706321.8
MDRFRE6593/3706321.8
MDRGER6593/3706321.8
MDRHUN6593/3706321.8
MDRITA6593/3706321.8
MDRPOR6593/3706321.8
MDRSPA6593/3706321.8
LNC6258/3706321.7
NDDF5897/3706321.6
NCBI5517/3706321.5
LCH5627/3706321.5
MMSL5735/3706321.5
DRUGBANK4706/3706321.3
MTHSPL4307/3706321.2
ICPC2ICD10ENG4257/3706321.1