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Table 1: The distribution of first authors, degrees, institutions, funding, and fields across time
1998 2003 2008 2013 2018
Count % Count % Count % Count % Count %
Radiologist vs nonradiologist 
 Radiologists 48 80.0% 55 83.3% 52 76.4% 56 66.7% 69 77.5%
 Nonradiologists 12 20.0% 11 16.7% 16 23.6% 28 33.3% 20 22.5%
Degree 
 Both MD and PhD 1 1.7% 4 6.2% 5 8.6% 9 11.3% 16 18.0%
 MD 56 96.6% 56 86.2% 47 81.0% 58 72.5% 64 72.0%
 PhD 2 3.4% 5 7.6% 6 10.4% 10 12.5% 8 8.9%
 Master of Science 0 0.0% 0 0.0% 0 0.0% 3 3.7% 1 1.1%
Institution 
 Multiple institutions 17 28.3% 15 22.7% 19 27.9% 43 51.2% 51 34.5%
 Single institution 43 71.7% 51 77.3% 49 72.1% 41 48.8% 38 65.5%
Funding 
 Funded 12 20.0% 14 21.2% 17 25.0% 39 46.4% 33 37.1%
 Unfunded 48 80.0% 52 78.8% 51 75.0% 45 53.6% 56 62.9%
Field 
 Brain 13 21.7% 26 39.4% 30 44.8% 28 33.7% 33 39.8%
 Head and Neck 24 40.0% 7 10.7% 9 13.4% 14 16.9% 13 15.7%
 IR-Vascular 16 26.7% 14 21.2% 19 28.4% 25 30.1% 22 26.5%
 Peds 6 10.0% 13 19.7% 2 3.0% 10 12.0% 5 6.0%
 PNS-Spine 1 1.6% 6 9.0% 7 10.4% 6 7.3% 10 12.0%
Note:—IR indicates interventional radiology; PNS, peripheral nervous system.