2015 MEDLINE/PubMed Baseline Excluding OLDMEDLINE Data: 21,332,373 Citations Found

Element Name	Citations	Occurrences	Min/Avg/Max Occurrences	Min/Avg/Max Length
PMID	21,332,373	21,332,373	1/1.00/1	1/7.49/8
DateCreated	21,332,373	21,332,373	1/1.00/1	8/8.00/8
DateCompleted	21,332,373	21,332,373	1/1.00/1	0/0.00/0
DateRevised	0	0	0/0.00/0	0/0.00/0
ISSN	21,141,404	21,141,404	0/1.00/1	9/9.00/9
IssnType=Electronic		4,452,960
IssnType=Print		16,688,444
Volume	20,949,911	20,949,911	0/1.00/1	1/2.24/50
Issue	20,032,052	20,032,052	0/1.00/1	1/1.44/60
PubDate	21,332,373	21,332,373	1/1.00/1	4/7.30/38
Title	21,332,373	21,332,373	1/1.00/1	2/37.40/585
ISOAbbreviation	21,331,941	21,331,941	0/1.00/1	1/16.52/96
ArticleTitle	21,332,373	21,332,373	1/1.00/1	2/88.03/1999
MedlinePgn	21,308,661	21,308,661	0/1.00/1	1/5.70/173
ELocationID	4,447,928	4,795,760	0/1.08/2	0/0.00/0
Valid Yes		4,795,760
Valid No		0
EIdType=doi		4,411,732
EIdType=pii		384,028
Abstract
AbstractText	14,011,224	14,011,224	0/1.00/1	24/1226.97/9996
CopyrightInformation	1,290,771	1,290,771	0/1.00/1	1/54.23/554
Identified as Structured Abstract	2,579,236
AbstractText	2,579,236	10,912,234	1/4.23/22
NLMCategory: UNLABELLED	68,542	68,542
NLMCategory: BACKGROUND	1,118,121	1,138,638
NLMCategory: OBJECTIVE	1,702,987	1,707,880
NLMCategory: METHODS	2,340,938	2,949,270
NLMCategory: RESULTS	2,425,823	2,430,599
NLMCategory: CONCLUSIONS	2,533,761	2,603,684
NLMCategory: UNASSIGNED	10,960	13,621
Author	20,889,141	79,322,162	0/3.80/3173	1/12.37/489
Valid Yes		79,305,010
Valid No		17,152
LastName	20,862,667	79,182,715	0/3.80/3172	1/6.72/129
ForeName	20,853,580	79,138,466	0/3.79/3172	1/4.17/111
Initials	20,853,580	79,138,465	0/3.79/3172	1/1.42/8
Suffix	357,968	377,789	0/1.06/7	2/2.21/3
CollectiveName	127,600	139,447	0/1.09/29	1/41.89/489
LastForeSuffix	20,862,667	79,182,715	0/3.80/3172	1/10.90/130
LastInitialsSuffix	20,862,667	79,182,715	0/3.80/3172	1/8.15/130
Affiliation	13,157,334	14,123,044	0/1.07/2937	1/106.18/2000
Identifier	4,059	7,000	0/1.72/18	16/20.76/51
Language	21,332,373	21,374,873	1/1.00/6	3/3.00/3
Grant	2,145,857	5,254,388	0/2.45/357	14/38.18/110
GrantID	2,066,656	5,111,288	0/2.47/357	1/10.58/66
Acronym	1,912,765	4,801,832	0/2.51/357	2/2.00/2
Agency	2,145,857	5,254,388	0/2.45/357	2/13.09/84
Country	2,145,857	5,254,388	0/2.45/357	5/12.97/14
PublicationType	21,332,373	39,504,308	1/1.85/10	4/18.35/56

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	2,715,109	2,715,109	0/1.00/1	1/79.67/611
Country	21,332,373	21,332,373	1/1.00/1	4/9.92/35
MedlineTA	21,332,373	21,332,373	1/1.00/1	1/15.41/96
NlmUniqueID	21,332,373	21,332,373	1/1.00/1	7/7.29/9
ISSNLinking	20,943,017	20,943,017	0/1.00/1	9/9.00/9
Chemical	11,077,178	43,210,327	0/3.90/58	4/21.22/250
RegistryNumber	11,077,178	43,210,327	0/3.90/58	1/4.68/15
NameOfSubstance	11,077,178	43,210,327	0/3.90/58	2/16.54/249
SupplMeshName	48,634	54,359	0/1.12/10	5/22.31/177
Type=Disease	30,746	32,065	0/1.04/5	5/28.45/177
Type=Protocol	17,928	22,294	0/1.24/10	5/13.47/43
CitationSubset	19,948,548	22,971,207	0/1.15/6	1/1.99/3
GeneSymbol	59,508	126,194	0/2.12/25	1/4.51/41
CommentsCorrections	3,130,743	64,736,085	0/20.68/4916	8/45.56/827
RetractionOf	3,240	3,528	0/1.09/20	25/94.87/344
RetractionIn	3,351	3,382	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	521,017	659,815	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	2,356	2,393	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	2,071,050	63,264,920	0/30.55/4916	22/45.54/198
MeshHeading	19,942,995	217,070,142	0/10.88/68	2/20.38/204
DescriptorName	19,942,995	217,070,142	0/10.88/68	2/14.11/104
Descriptor Major	9,904,816	17,221,196	0/1.74/37
Descriptor Not Major	19,844,618	196,175,734	0/9.89/63
QualifierName	18,717,383	121,268,358	0/6.48/71	5/11.22/29
Qualifier Major	17,922,245	52,295,978	0/2.92/52
Qualifier Not Major	15,183,024	68,972,380	0/4.54/71
Descriptor and/or Qualifier Major	19,813,750	66,853,241	0/3.37/50
PersonalNameSubject	140,612	162,583	0/1.16/28	3/12.21/75
LastName	140,612	162,583	0/1.16/28	1/7.36/69
ForeName	136,323	156,911	0/1.15/28	1/3.60/48
Initials	136,323	156,911	0/1.15/28	1/1.42/6
Suffix	1,129	1,160	0/1.03/3	2/2.10/3
LastForeSuffix	140,612	162,583	0/1.16/28	3/10.84/73
LastInitialsSuffix	140,612	162,583	0/1.16/28	2/8.74/69

Element Name	Citations	Occurrences	Min/Avg/Max Occurrences	Min/Avg/Max Length
NumberOfReferences	1,538,075	1,538,075	0/1.00/1	1/2.10/8
OtherID	2,670,637	3,134,396	0/1.17/6	1/10.08/36
NLM Source		2,822,725
OtherAbstract
AbstractText	66,981	67,542	0/1.01/5	38/1179.23/4096
CopyrightInformation	1,855	1,855	0/1.00/1	11/16.80/17
Keyword	614,445	4,133,148	0/6.73/245	1/16.04/259
Keyword Major	80,771	523,609	0/6.48/50
Keyword Not Major	613,239	3,609,539	0/5.89/245
GeneralNote	149,386	282,800	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	1,539
Words in Title Average	12.11
Words in Title Max	341
Words in Abstract Average	185.33
Words in Abstract	1,696
AB Size Zero	7,321,149
AB Size < 1,000	4,958,293
AB Size 1,000 - 1,999	8,161,106
AB Size 2,000 - 2,999	844,435
AB Size 3,000 - 3,999	40,924
AB Size 4,000 - 4,999	4,451
AB Size > 5,000	2,015
Number of MH Occurrences with NO SHs	129,974,757
Number of MH Occurrences with ONE SH	60,882,723
Number of MH Occurrences with SHs	87,095,385
Number of MH Type=Geographic	3,673,212

CollectiveName, Author, and Investigator Related	Counts
Citations containing ONLY CollectiveName	26,474
Citations containing BOTH CollectiveName and Author LastName	101,126
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	0
Investigator Found Without Collective	0

MedlineCitation Status	Counts
Completed	0
In-Process	0
In-Data-Review	0
PubMed-not-MEDLINE	1,383,825
OLDMEDLINE	0
MEDLINE	19,948,548

Article PubModel	Counts
Print-Electronic	1,841,436
Electronic-Print	23,421
Print	15,094,858
Electronic-eCollection	72,306
Electronic	256,617

JournalIssue CitedMedium	Counts
Internet	4,491,911
Print	16,840,462

Owner	MedlineCitation	GeneralNote	Keyword	OtherAbstract
NLM	21,200,070	4,618	0	0
NASA	10,752	4,570	12,939	409
PIP	37,861	63,794	68,852	53,145
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	4,924,921
United Kingdom	270,167
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	521,205
E	91,770
F	8,016
H	264,467
IM	18,664,377
J	68,940
K	23,787
N	626,833
OM	0
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	14,731
Biography	138,325
Case Reports	1,668,597
Classical Article	5,845
Clinical Conference	6,558
Clinical Trial	486,413
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	1,674,489
Congresses	60,751
Consensus Development Conference	9,093
Consensus Development Conference, NIH	719
Controlled Clinical Trial	88,073
Corrected and Republished Article	1,441
Dictionary	535
Directory	6,618
Duplicate Publication	1,167
Editorial	350,091
English Abstract	1,722,240
Evaluation Studies	196,374
Festschrift	1,465
Government Publications	189
Guideline	15,410
Historical Article	294,033
Interactive Tutorial	218
Publication Types Counts (continued):
Interview	24,886
Introductory Journal Article	30,290
Journal Article	19,835,732
Lectures	5,994
Legal Cases	10,417
Legislation	1,668
Letter	830,530
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	39,864
Practice Guideline	19,308
Pragmatic Clinical Trial	73
Published Erratum	1,180
Randomized Controlled Trial	376,367
Research Support, American Recovery and Reinvestment Act	1,424
Research Support, N.I.H., Extramural	745,378
Research Support, N.I.H., Intramural	36,045
Research Support, Non-U.S. Gov't	5,619,348
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	3,383
Retraction of Publication	3,305
Review	1,893,610
Scientific Integrity Review	190
Technical Report	2,260
Twin Study	6,262
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	4,095,278
DOI and PII, MedlinePgn Not Found	18,894
DOI and PII, MedlinePgn Found	328,938

PMID Versioning	Counts
Version 1	21,332,095
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