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Unified Medical Language System (UMLS)

MSH (MeSH) - Statistics


Semantic Type Distribution

Semantic Type IDSemantic Type NameCount Percentage Distribution
T109Organic Chemical19009132.3
T116Amino Acid, Peptide, or Protein11956620.3
T121Pharmacologic Substance9314615.8
T123Biologically Active Substance6691611.4
T126Enzyme276354.7
T047Disease or Syndrome112761.9
T114Nucleic Acid, Nucleoside, or Nucleotide98311.7
T130Indicator, Reagent, or Diagnostic Aid76851.3
T129Immunologic Factor66421.1

Term Type Counts

Term TypeExpanded FormCount
CEEntry term for a Supplementary Concept270275
NMName of Supplementary Concept246162
PMMachine permutation118137
PCEPreferred entry term for Supplementary Concept72856
ETEntry term61173
MHMain heading28939
PEPPreferred entry term26594
N1Chemical Abstracts Service Type 1 name of a chemical23020
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 identifier824448
THMeSH Thesaurus ID - identifies thesauri other than MeSH in which the MeSH heading or cross-reference is included.750050
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)351580
RNRegistry Number - series of numbers and hyphens (any leading zeros in an RN are dropped) or a series of numbers and periods, preceded by EC297493
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.275180
SCMeSH Supplemental record class.246162
FRMeSH Frequency246161
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)245333
SOSScope Statement207951
MMRMeSH revision date YYYYMMDD - date of the last major revision to the term's MeSH record.196064
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.58837
PIMeSH heading or heading/subheading combination(s) followed by a date range in parentheses (YYYY).51007
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.45082
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.37843
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)15384
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.13664
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.13381
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
QB/can be qualified by./Empty relationship attribute605995
AQ/Allowed qualifier/Empty relationship attribute605995
SIB/has sibling relationship in a Metathesaurus source vocabulary./Empty relationship attribute455696
RN/mapped_tohas a narrower relationship/Mapped to351580
RB/mapped_fromhas a broader relationship/Mapped from351580
SY/has_permuted_termsource asserted synonymy./Has permuted term118137
SY/permuted_term_ofsource asserted synonymy./Permuted term of118137
RN/has a narrower relationship/Empty relationship attribute92538
RB/has a broader relationship/Empty relationship attribute92538
CHD/has child relationship in a Metathesaurus source vocabulary /Empty relationship attribute39401
PAR/has parent relationship in a Metathesaurus source vocabulary /Empty relationship attribute39401
RO/mapping_qualifier_ofhas relationship other than synonymous, narrower, or broader/Mapping qualifier of34877
RO/has_mapping_qualifierhas relationship other than synonymous, narrower, or broader/Has mapping qualifier34877
RO/has relationship other than synonymous, narrower, or broader/Empty relationship attribute27002
SY/entry_version_ofsource asserted synonymy./Entry version of16273
SY/has_entry_versionsource asserted synonymy./Has entry version16273
RN/isahas a narrower relationship/Is a13664
RB/inverse_isahas a broader relationship/Inverse is a13664
SY/sort_version_ofsource asserted synonymy./Sort version of3930
SY/has_sort_versionsource asserted synonymy./Has sort version3930
SY/has_expanded_formsource asserted synonymy./Has expanded form79
SY/expanded_form_ofsource asserted synonymy./Expanded form of79

Definition Count

Count
30900

Source Overlap

Source# Concepts Sharing Atom/# Total ConceptsPercentage Distribution
MSHFRE46219/37493912.3
MSHGER42403/37493911.3
MSHCZE41458/37493911.1
MSHITA39402/37493910.5
MSHPOR38635/37493910.3
MSHSPA38341/37493910.2
MSHNOR32610/3749398.7
SNOMEDCT_US29962/3749398.0
SCTSPA29433/3749397.9
MSHRUS28938/3749397.7
MSHPOL28939/3749397.7
MSHSWE28545/3749397.6
NCI28105/3749397.5
MSHFIN24696/3749396.6
MSHJPN24863/3749396.6
CHV24192/3749396.5
MSHDUT20650/3749395.5
SNMI19655/3749395.2
NDFRT16376/3749394.4
RCD15800/3749394.2
CSP10729/3749392.9
LCH_NW10345/3749392.8
SNM10255/3749392.7
MEDCIN9046/3749392.4
MSHSCR9094/3749392.4
RXNORM9142/3749392.4
NCI_FDA8781/3749392.3
OMIM7928/3749392.1
AOD7222/3749391.9
MDRJPN6630/3749391.8
MDR6643/3749391.8
MDRCZE6643/3749391.8
MDRDUT6643/3749391.8
MDRFRE6643/3749391.8
MDRGER6643/3749391.8
MDRHUN6643/3749391.8
MDRITA6643/3749391.8
MDRPOR6643/3749391.8
MDRSPA6643/3749391.8
LNC6380/3749391.7
NCBI5925/3749391.6
NDDF5939/3749391.6
LCH5627/3749391.5
MMSL5772/3749391.5
DRUGBANK5120/3749391.4
MTHSPL4362/3749391.2
ICPC2ICD10ENG4262/3749391.1