Data
Description of data fields
General data fields
| Display Name | API Name | Description |
|---|---|---|
| PMID | pmid | PubMed Identifier, an article ID as assigned in PubMed by the National Library of Medicine |
| DOI | doi | Digital Object Identifier, if available |
| Year | year | Year the article was published |
| Title | title | Title of the article |
| Authors | authors | List of author names |
| Journal | journal | Journal name (ISO abbreviation) |
| Article | is_research_article | Flag indicating whether the Publication Type tags for this article are consistent with that of a primary research article |
| Relative Citation Ratio | relative_citation_ratio | Relative Citation Ratio (RCR)--OPA's metric of scientific influence. RCR represents the field- and time-normalized citation rate, and is benchmarked to 1.0 for a typical (median) NIH paper in the corresponding year of publication. A paper with an RCR of 1.0 has received the same number of cites/year as the median NIH-funded paper in its field, a paper with an RCR of 2.0 has received twice as many cites/year as the median NIH-funded paper in its field, while an RCR of 0.5 means that it is receiving half as many citations per year. Calculation details are documented in Hutchins et al., PLoS Biol. 2016;14(9):e1002541. |
| Provisional | provisional | RCRs for papers published in the previous two years are flagged as "provisional", to reflect that citation metrics for newer articles are not necessarily as stable as they are for older articles. Provisional RCRs are provided for papers published previous year, if they have received with 5 citations or more, despite being, in many cases, less than a year old. All papers published the year before the previous year receive provisional RCRs. The current year is considered to be the NIH Fiscal Year which starts in October. For example, in July 2019 (NIH Fiscal Year 2019), papers from 2018 receive provisional RCRs if they have 5 citations or more, and all papers from 2017 receive provisional RCRs. In October 2019, at the start of NIH Fiscal Year 2020, papers from 2019 receive provisional RCRs if they have 5 citations or more and all papers from 2018 receive provisional RCRs. |
Influence module
| Display Name | API Name | Description |
|---|---|---|
| Total Citations | citation_count | Number of unique articles that have cited this one |
| Citations Per Year | citations_per_year | Citations per year that this article has received since its publication. If this appeared as a preprint and a published article, the year from the published version is used as the primary publication date. This is the numerator for the Relative Citation Ratio. |
| Field Citation Rate | field_citation_rate | Measure of the intrinsic citation rate of this paper's field, estimated using its co-citation network. |
| Expected Citation Rate | expected_citations_per_year | Citations per year that NIH-funded articles, with the same Field Citation Rate and published in the same year as this paper, recieve. This is the denominator for the Relative Citation Ratio. |
| NIH Percentile | nih_percentile | Percentile rank of this paper's RCR compared to all NIH publications. For example, 95% indicates that this paper's RCR is higher than 95% of all NIH funded publications. |
Translation Module
| Display Name | API Name | Description |
|---|---|---|
| Human | human | Fraction of MeSH terms that are in the Human category (out of this article's MeSH terms that fall into the Human, Animal, or Molecular/Cellular Biology categories) |
| Animal | animal | Fraction of MeSH terms that are in the Animal category (out of this article's MeSH terms that fall into the Human, Animal, or Molecular/Cellular Biology categories) |
| Mol/Cell | molecular_cellular | Fraction of MeSH terms that are in the Molecular/Cellular Biology category (out of this article's MeSH terms that fall into the Human, Animal, or Molecular/Cellular Biology categories) |
| xCoord | x_coord | X coordinate of the article on the Triangle of Biomedicine |
| yCoord | y_coord | Y Coordinate of the article on the Triangle of Biomedicine |
| Clinical | is_clinical | Flag indicating that this paper meets the definition of a clinical article. |
| Cited By Clin. | cited_by_clin | PMIDs of clinical articles that this article has been cited by. |
| APT | apt | Approximate Potential to Translate is a machine learning-based estimate of the likelihood that this publication will be cited in later clinical trials or guidelines. |
Open Citations Module
| Display Name | API Name | Description |
|---|---|---|
| Cited By PMIDs | cited_by | PMIDs of articles that have cited this one. |
| References | references | PMIDs of articles in this article's reference list. |
Definitions for derived data
Article (is_research_article)
Flag indicating whether the Publication Type tags for this article are consistent with that of a primary research article. To be counted as an Article, a paper's Publication Types must include at least one Type from the qualifying list (e.g. Journal Article or Clinical Trial) and cannot contain any from the disqualifying list (e.g. Editorial or Review):
| Publication Type | Qualifying/Disqualifying |
|---|---|
| Case Reports | Qualifying |
| Classical Article | Qualifying |
| Clinical Trial | Qualifying |
| Clinical Trial, Phase I | Qualifying |
| Clinical Trial, Phase II | Qualifying |
| Clinical Trial, Phase III | Qualifying |
| Clinical Trial, Phase IV | Qualifying |
| Comparative Study | Qualifying |
| Controlled Clinical Trial | Qualifying |
| Corrected and Republished Article | Qualifying |
| Dataset | Qualifying |
| Duplicate Publication | Qualifying |
| Evaluation Studies | Qualifying |
| Journal Article | Qualifying |
| Letter | Qualifying |
| Meta-Analysis | Qualifying |
| Multicenter Study | Qualifying |
| Observational Study | Qualifying |
| Pragmatic Clinical Trial | Qualifying |
| Preprint | Qualifying |
| Randomized Controlled Trial | Qualifying |
| Technical Report | Qualifying |
| Twin Study | Qualifying |
| Validation Studies | Qualifying |
| Addresses | Disqualifying |
| Autobiography | Disqualifying |
| Bibliography | Disqualifying |
| Biography | Disqualifying |
| Clinical Conference | Disqualifying |
| Comment | Disqualifying |
| Congresses | Disqualifying |
| Consensus Development Conference | Disqualifying |
| Consensus Development Conference, NIH | Disqualifying |
| Dictionary | Disqualifying |
| Directory | Disqualifying |
| Editorial | Disqualifying |
| Festschrift | Disqualifying |
| Government Publications | Disqualifying |
| Guideline | Disqualifying |
| Historical Article | Disqualifying |
| Interactive Tutorial | Disqualifying |
| Interview | Disqualifying |
| Introductory Journal Article | Disqualifying |
| Lectures | Disqualifying |
| Legal Cases | Disqualifying |
| Legislation | Disqualifying |
| News | Disqualifying |
| Newspaper Article | Disqualifying |
| Overall | Disqualifying |
| Patient Education Handout | Disqualifying |
| Periodical Index | Disqualifying |
| Personal Narratives | Disqualifying |
| Portraits | Disqualifying |
| Practice Guideline | Disqualifying |
| Published Erratum | Disqualifying |
| Retracted Publication | Disqualifying |
| Retraction of Publication | Disqualifying |
| Review | Disqualifying |
| Scientific Integrity Review | Disqualifying |
| Webcasts | Disqualifying |
Based on manual curation of a random sample of articles published in 2013, this classification strategy yields 92% accuracy. 8% of 'article' assignments on average were incorrect, while 5% of 'non-article' assignments were incorrect. Most errors tend to occur in journals that are not indexed in MedLine, suggesting that persons whose publication records are concentrated in non-MedLine journals may have disproportionately high error rates in this classification schema.
Clinical (is_clinical)
Flag indicating whether the Publication Type tags for this article are consistent with that of a clinical article. Publication Types must include at least one Type from the following list:
- Clinical Study
- Clinical Trial
- Clinical Trial, Phase I
- Clinical Trial, Phase II
- Clinical Trial, Phase III
- Clinical Trial, Phase IV
- Adaptive Clinical Trial
- Controlled Clinical Trial
- Randomized Controlled Trial
- Clinical Trial Protocol
- Observational Study
- Guideline
- Practice Guideline
MeSH addresses for paper categories in the Translation Module
These definitions have been described in two previous papers. Note that due to annual updates to the MeSH Tree, current definitions may not align perfectly with the MeSH addresses described in the papers, which used MeSH trees from specific fiscal years.
Human
- M01 (Persons)
- B01.050.150.900.649.313.988.400.112.400.400 (Human)
Animal
- B01 (Eukaryota) not B01.050.150.900.649.313.988.400.112.400.400 (Human)
Molecular/Cellular Biology
- A11 (Cells)
- B02 (Archaea)
- B03 (Bacteria)
- B04 (Viruses)
- G02 (Chemical Phenomena)
- G04 (Cell Physiological Phenomena)
Diseases
- C (Diseases) not C22 (Animal Diseases)
Analytical, Diagnostic and Therapeutic Techniques
- E (Analytical, Diagnostic and Therapeutic Techniques, and Equipment) not E07 (Equipment and Supplies)
Chemicals and Drugs
- D (Chemicals and Drugs)