Table 4.
Characteristics of Authorship
| Publication Year | No. of Authorsa | Degree of First Authorb | Countryb | ||||
| MD | MD/PhD | PhD | Non-MD | US | Non-US | ||
| Overall | 6.2 (2.6) | 1969 (73.8) | 255 (9.6) | 158 (5.9) | 286 (10.7) | 1655 (62.0) | 1013 (38.0) |
| 2012 | 5.29 (2.0) | 245 (75.4) | 30 (9.2) | 20 (6.2) | 30 (9.2) | 191 (58.8) | 134 (41.2) |
| 2013 | 6.16 (2.6) | 239 (76.1) | 27 (8.6) | 17 (5.4) | 31 (9.9) | 194 (61.8) | 120 (38.2) |
| 2014 | 6.17 (2.4) | 249 (75.2) | 29 (8.8) | 16 (4.8) | 37 (11.2) | 199 (60.1) | 132 (39.9) |
| 2015 | 6.16 (2.4) | 157 (76.2) | 17 (8.3) | 14 (6.8) | 18 (8.7) | 146 (70.9) | 60 (29.1) |
| 2016 | 6.09 (2.5) | 152 (72) | 25 (11.8) | 16 (7.6) | 18 (8.5) | 124 (58.8) | 87 (41.2) |
| 2017 | 6.14 (2.5) | 171 (77.4) | 14 (6.3) | 11 (5) | 25 (11.3) | 153 (69.2) | 68 (30.8) |
| 2018 | 6.13 (2.2) | 171 (74.3) | 25 (10.9) | 11 (4.8) | 23 (10) | 145 (63) | 85 (37) |
| 2019 | 6.77 (2.9) | 150 (68.8) | 28 (12.8) | 12 (5.5) | 28 (12.8) | 133 (61) | 85 (39) |
| 2020 | 6.65 (3.6) | 152 (76) | 14 (7) | 10 (5) | 24 (12) | 120 (60) | 80 (40) |
| 2021 | 6.27 (2.7) | 147 (70.7) | 18 (8.7) | 18 (8.7) | 25 (12) | 126 (60.6) | 82 (39.4) |
| 2022 | 6.92 (3.1) | 136 (66.7) | 28 (13.7) | 13 (6.4) | 27 (13.2) | 124 (60.8) | 80 (39.2) |
a
Values presented as mean (SD).
b
Values presented as n (%).