2015 MEDLINE®/PubMed® Baseline: 23,343,329 Citations Found

Element Name	Citations	Occurrences	Min/Avg/Max Occurrences	Min/Avg/Max Length
PMID	23,343,329	23,343,329	1/1.00/1	1/7.53/8
DateCreated	23,343,329	23,343,329	1/1.00/1	8/8.00/8
DateCompleted	23,343,329	23,343,329	1/1.00/1	0/0.00/0
DateRevised	0	0	0/0.00/0	0/0.00/0
ISSN	22,969,853	22,969,853	0/1.00/1	9/9.00/9
IssnType=Electronic		4,457,325
IssnType=Print		18,512,528
Volume	22,949,373	22,949,373	0/1.00/1	1/2.22/50
Issue	21,213,747	21,213,747	0/1.00/1	1/1.45/60
PubDate	23,343,329	23,343,329	1/1.00/1	4/7.32/38
Title	23,343,329	23,343,329	1/1.00/1	2/37.24/585
ISOAbbreviation	23,342,892	23,342,892	0/1.00/1	1/16.53/96
ArticleTitle	23,343,329	23,343,329	1/1.00/1	2/86.09/1999
MedlinePgn	23,319,617	23,319,617	0/1.00/1	1/5.68/173
ELocationID	4,448,522	4,796,354	0/1.08/2	0/0.00/0
Valid Yes		4,796,354
Valid No		0
EIdType=doi		4,412,326
EIdType=pii		384,028
Abstract
AbstractText	14,026,022	14,026,022	0/1.00/1	24/1226.65/9996
CopyrightInformation	1,290,771	1,290,771	0/1.00/1	1/54.23/554
Identified as Structured Abstract	2,579,239
AbstractText	2,579,239	10,912,243	1/4.23/22
NLMCategory: UNLABELLED	68,545	68,545
NLMCategory: BACKGROUND	1,118,121	1,138,638
NLMCategory: OBJECTIVE	1,702,987	1,707,880
NLMCategory: METHODS	2,340,939	2,949,273
NLMCategory: RESULTS	2,425,824	2,430,600
NLMCategory: CONCLUSIONS	2,533,762	2,603,685
NLMCategory: UNASSIGNED	10,961	13,622
Author	22,853,415	82,695,798	0/3.62/3173	1/12.29/489
Valid Yes		82,678,646
Valid No		17,152
LastName	22,826,935	82,556,338	0/3.62/3172	1/6.74/129
ForeName	22,797,927	82,464,750	0/3.62/3172	1/4.08/111
Initials	22,797,927	82,464,749	0/3.62/3172	1/1.42/8
Suffix	403,372	425,960	0/1.06/7	2/2.20/3
CollectiveName	127,613	139,460	0/1.09/29	1/41.89/489
LastForeSuffix	22,826,935	82,556,338	0/3.62/3172	1/10.83/130
LastInitialsSuffix	22,826,935	82,556,338	0/3.62/3172	1/8.17/130
Affiliation	13,159,142	14,124,852	0/1.07/2937	1/106.17/2000
Identifier	4,059	7,000	0/1.72/18	16/20.76/51
Language	23,343,329	23,392,193	1/1.00/6	3/3.00/3
Grant	2,145,935	5,254,533	0/2.45/357	14/38.18/110
GrantID	2,066,734	5,111,433	0/2.47/357	1/10.58/66
Acronym	1,912,791	4,801,869	0/2.51/357	2/2.00/2
Agency	2,145,935	5,254,533	0/2.45/357	2/13.09/84
Country	2,145,935	5,254,533	0/2.45/357	5/12.97/14
PublicationType	23,343,329	41,589,473	1/1.78/10	4/18.17/56

Element Name	Citations	Occurrences	Min/Avg/Max Occurrences	Min/Avg/Max Length
DataBank	254,570	258,708	0/1.02/4	5/111.45/47047
DataBankName	254,570	258,708	0/1.02/4	3/7.53/18
AccessionNumber	254,570	3,441,161	0/13.52/5880	2/7.81/20
ArticleDate	3,767,594	3,767,594	0/1.00/1	8/8.00/8
VernacularTitle	3,472,592	3,472,592	0/1.00/1	1/77.83/611
Country	23,343,329	23,343,329	1/1.00/1	4/10.14/35
MedlineTA	23,343,329	23,343,329	1/1.00/1	1/15.46/96
NlmUniqueID	23,343,329	23,343,329	1/1.00/1	7/7.29/9
ISSNLinking	22,752,972	22,752,972	0/1.00/1	9/9.00/9
Chemical	11,648,042	44,184,266	0/3.79/58	4/21.15/250
RegistryNumber	11,648,042	44,184,266	0/3.79/58	1/4.70/15
NameOfSubstance	11,648,042	44,184,266	0/3.79/58	2/16.45/249
SupplMeshName	48,790	54,515	0/1.12/10	5/22.30/177
Type=Disease	30,902	32,221	0/1.04/5	5/28.41/177
Type=Protocol	17,928	22,294	0/1.24/10	5/13.47/43
CitationSubset	21,959,504	25,007,997	0/1.14/6	1/1.99/3
GeneSymbol	59,508	126,194	0/2.12/25	1/4.51/41
CommentsCorrections	3,197,949	65,154,578	0/20.37/4916	8/45.56/827
RetractionOf	3,240	3,528	0/1.09/20	25/94.87/344
RetractionIn	3,352	3,383	0/1.01/2	27/58.02/341
SummaryForPatientsIn	1,121	1,135	0/1.01/3	29/45.74/72
OriginalReportIn	1,089	1,135	0/1.04/3	32/48.04/68
CommentOn	582,747	650,133	0/1.12/34	8/45.67/227
CommentIn	521,105	659,904	0/1.27/57	24/47.78/125
ErratumIn	131,232	133,479	0/1.02/10	9/44.06/827
ErratumFor	1,163	1,188	0/1.02/7	8/46.08/104
ReprintIn	2,363	2,400	0/1.02/4	27/49.92/111
ReprintOf	2,261	2,271	0/1.00/4	26/49.22/211
RepublishedFrom	1,441	1,446	0/1.00/2	19/45.45/110
RepublishedIn	1,251	1,256	0/1.00/2	26/47.23/92
UpdateIn	5,050	5,082	0/1.01/2	33/49.91/60
UpdateOf	4,848	4,849	0/1.00/2	31/50.11/100
PartialRetractionOf	36	37	0/1.03/2	32/115.51/211
PartialRetractionIn	36	36	0/1.00/1	36/81.44/199
Cites	2,138,171	63,683,316	0/29.78/4916	22/45.53/198
MeshHeading	21,850,751	221,985,614	0/10.16/103	2/20.26/204
DescriptorName	21,850,751	221,985,614	0/10.16/103	2/14.09/104
Descriptor Major	11,384,724	21,038,574	0/1.85/103	0
Descriptor Not Major	20,580,656	197,236,029	0/9.58/63	0
QualifierName	19,432,254	122,303,677	0/6.29/71	5/11.21/29
Qualifier Major	18,636,573	53,329,623	0/2.86/52	0
Qualifier Not Major	15,183,959	68,974,054	0/4.54/71	0
Descriptor and/or Qualifier Major	21,714,929	71,693,111	0/3.30/103	0
PersonalNameSubject	167,896	190,614	0/1.14/28	3/12.57/75
LastName	167,896	190,614	0/1.14/28	1/7.36/69
ForeName	162,358	183,590	0/1.13/28	1/3.98/48
Initials	162,358	183,590	0/1.13/28	1/1.42/6
Suffix	1,270	1,306	0/1.03/3	1/2.20/12
LastForeSuffix	167,896	190,614	0/1.14/28	3/11.20/73
LastInitialsSuffix	167,896	190,614	0/1.14/28	2/8.74/69

Element Name	Citations	Occurrences	Min/Avg/Max Occurrences	Min/Avg/Max Length
NumberOfReferences	1,546,235	1,546,235	0/1.00/1	1/2.10/8
OtherID	3,951,961	4,470,586	0/1.13/6	1/11.14/391
NLM Source		2,914,623
OtherAbstract
AbstractText	67,000	67,561	0/1.01/5	38/1179.23/4096
CopyrightInformation	1,855	1,855	0/1.00/1	11/16.80/17
Keyword	2,606,909	9,100,818	0/3.49/245	1/16.49/259
Keyword Major	2,073,235	5,491,086	0/2.65/105
Keyword Not Major	613,258	3,609,732	0/5.89/245
GeneralNote	149,585	282,999	0/1.89/32	2/34.27/1226
SpaceFlightMission	4,188	19,395	0/4.63/12	6/13.87/28
InvestigatorList	33,695
Investigator: Inclusive (pre-2008 Policy)	8,936	10,291	0/1.15/6	7/31.05/96
LastName	8,936	10,291	0/1.15/6	2/6.69/16
ForeName	8,928	10,280	0/1.15/6	1/2.70/9
Initials	8,928	10,280	0/1.15/6	1/1.85/2
Suffix	16	16	0/1.00/1	2/2.19/3
Affiliation	8,935	10,290	0/1.15/6	3/19.81/83
LastForeSuffix	8,936	10,291	0/1.15/6	3/9.40/19
LastInitialsSuffix	8,936	10,291	0/1.15/6	3/8.54/18
Investigator: 2008 Policy	24,759	1,527,907	0/61.71/3741	2/12.54/164
LastName	24,759	1,527,907	0/61.71/3741	1/7.01/158
ForeName	24,689	1,515,724	0/61.39/3740	1/4.39/46
Initials	24,689	1,515,724	0/61.39/3740	1/1.19/6
Suffix	1,826	3,219	0/1.76/20	2/2.30/3
Affiliation	22	22	0/1.00/1	8/23.64/47
LastForeSuffix	24,759	1,527,907	0/61.71/3741	2/11.36/163
LastInitialsSuffix	24,759	1,527,907	0/61.71/3741	2/8.19/159

Element Name	Size or Count
Average Record Size in Bytes	1,439
Words in Title Average	11.85
Words in Title Max	341
Words in Abstract Average	185.29
Words in Abstract Max	1,696
AB Size Zero	9,317,307
AB Size < 1,000	4,967,419
AB Size 1,000 - 1,999	8,166,236
AB Size 2,000 - 2,999	844,900
AB Size 3,000 - 3,999	40,983
AB Size 4,000 - 4,999	4,464
AB Size > 5,000	2,020
Number of MH Occurrences with NO SHs	133,865,663
Number of MH Occurrences with ONE SH	61,897,094
Number of MH Occurrences with SHs	88,119,951
Number of MH Type=Geographic	3,711,011

CollectiveName, Author, and Investigator Related	Counts
Citations containing ONLY CollectiveName	26,480
Citations containing BOTH CollectiveName and Author LastName	101,133
Citations containing BOTH CollectiveName and Investigator LastName	24,732
Citations containing BOTH Author LastName and Investigator LastName	32,026
Citations containing Investigator LastName and Owned by NASA	3,904
Both Investigator and Author Found	32,026
Investigator Found Without Collective	8,963

MedlineCitation Status	Counts
Completed	0
In-Process	0
In-Data-Review	0
PubMed-not-MEDLINE	1,383,825
OLDMEDLINE	265,021
MEDLINE	21,694,483

Article PubModel	Counts
Print-Electronic	1,841,436
Electronic-Print	23,421
Print	17,025,617
Electronic-eCollection	72,306
Electronic	256,617

JournalIssue CitedMedium	Counts
Internet	4,496,573
Print	18,846,756

Owner	MedlineCitation	GeneralNote	Keyword	OtherAbstract
NLM	23,210,973	4,813	1,992,464	0
NASA	10,752	4,570	12,939	409
PIP	37,914	63,798	68,871	53,164
KIE	31,953	209,616	73,817	3,026
HSR	8,061	202	0	0
HMD	43,676	0	0	0
SIS	0	0	0	0
NOTNLM	0	0	459,266	0
AIDS	0	0	0	5,342
Publisher	0	0	0	5,620

Grant Country	Occurrences
United States	4,925,065
United Kingdom	270,168
Italy	11,102
Canada	42,561
Austria	3,607
International	2,008
Ireland	22

CitationSubsets	Counts
AIM	2,011,553
B	10,445
C	7,545
D	536,836
E	91,770
F	8,016
H	264,467
IM	18,664,377
J	68,959
K	23,787
N	637,017
OM	2,010,956
Q	201,857
QIS	6,989
QO	24,429
R	3,602
S	188,645
T	56,155
X	190,592

Publication Types	Counts
Addresses	4,428
Autobiography	2,910
Bibliography	15,176
Biography	165,649
Case Reports	1,696,795
Classical Article	5,845
Clinical Conference	6,561
Clinical Trial	486,416
Clinical Trial, Phase I	14,146
Clinical Trial, Phase II	22,802
Clinical Trial, Phase III	9,034
Clinical Trial, Phase IV	948
Comment	582,747
Comparative Study	1,674,497
Congresses	60,760
Consensus Development Conference	9,093
Consensus Development Conference, NIH	719
Controlled Clinical Trial	88,076
Corrected and Republished Article	1,441
Dictionary	535
Directory	6,618
Duplicate Publication	1,167
Editorial	350,092
English Abstract	1,722,284
Evaluation Studies	196,376
Festschrift	1,465
Government Publications	189
Guideline	15,410
Historical Article	304,427
Interactive Tutorial	218
Publication Types Counts (continued):
Interview	24,886
Introductory Journal Article	30,290
Journal Article	21,846,236
Lectures	5,995
Legal Cases	10,418
Legislation	1,668
Letter	830,540
Meta-Analysis	49,593
Multicenter Study	173,198
News	162,240
Newspaper Article	17,997
Observational Study	5,962
Overall	27,298
Patient Education Handout	4,044
Periodical Index	322
Personal Narratives	1,126
Portraits	39,867
Practice Guideline	19,308
Pragmatic Clinical Trial	73
Published Erratum	1,180
Randomized Controlled Trial	376,368
Research Support, American Recovery and Reinvestment Act	1,424
Research Support, N.I.H., Extramural	745,378
Research Support, N.I.H., Intramural	36,046
Research Support, Non-U.S. Gov't	5,619,349
Research Support, U.S. Gov't, Non-P.H.S.	673,357
Research Support, U.S. Gov't, P.H.S.	1,446,292
Retracted Publication	3,384
Retraction of Publication	3,305
Review	1,901,817
Scientific Integrity Review	190
Technical Report	2,260
Twin Study	6,263
Validation Studies	68,471
Video-Audio Media	6,193
Webcasts	311

ELocationId EIdType	Counts
DOI or PII, MedlinePgn Not Found	4,818
DOI or PII, MedlinePgn Found	4,095,872
DOI and PII, MedlinePgn Not Found	18,894
DOI and PII, MedlinePgn Found	328,938

PMID Versioning	Counts
Version 1	23,343,051
Version 2	232
Version 3	27
Version 4	7
Version 5	3
Version 6	3
Version 7	2
Version 8	2
Version 9	1
Version 10	1