Table 1. Characteristics of 499 randomly selected English language articles from PubMed between 2015 and 2018.
| Number (%) | ||
|---|---|---|
| Total PubMed articles | 499 | |
| Year of publication | 2015 | 121 (24%) |
| 2016 | 121 (24%) | |
| 2017 | 143 (29%) | |
| 2018 | 114 (23%) | |
| On PMC | 197 (40%) | |
| Area | Preclinical research | 331 (66%) |
| Clinical research | 18 (4%) | |
| Field of science | Medicine | 274 (55%) |
| Health services | 69 (14%) | |
| Brain research | 46 (9%) | |
| Biology | 46 (9%) | |
| Other (n = 5) | 62 (12%) | |
| Characteristics | Median (IQR) | |
| Authors per article | 4 (2–7) | |
| Affiliations per article | 5 (2–8) | |
| Citation count | 2 (0–5) | |
| Journal Impact Factor | 2.8 (2.0–4.3) | |
| Altmetric Attention Score | 0.5 (0.0–2.7) |
Missing values: Field of science (2, 1%), Affiliations per article (25, 5%), Citation count (6, 1%), and Journal Impact Factor (76, 15%). Field of science was taken from SciTech, Citation count from Crossref (May 30, 2019), Journal Impact Factor of 2018 from WOS, and Altmetric Attention Score from Altmetric (May 30, 2019).
IQR, interquartile range; PMC, PubMed Central; WOS, Web of Science.