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. 2018 Sep 12;13(9):e0199648. doi: 10.1371/journal.pone.0199648

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Fig 3 — Index institution density tertiles: 1 = 14 to 37 ENI per institution; 2 = 6 to 13 ENI per institution; 3 = 1 to 5 ENI per institution. ENI from institutions in tertiles 1 and 2 were more likely to be funded (70% and 65%, respectively) than ENI from institutions in tertile 3 (47%) (p < 0.0001). The highest ENI funding rate (70%) was in the 1^st tertile, which included just 21 institutions.