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Table 6 Number of patients with undiagnosed diseases per university hospital department

From: Survey on patients with undiagnosed diseases in Japan: potential patient numbers benefiting from Japan’s initiative on rare and undiagnosed diseases (IRUD)

Survey-2 Department Percentage of doctors needing IRUD Number of participating doctors (persons) Number of patients who would be referred to IRUD per doctor needing IRUD (cases/person) Total number of doctors per department (persons) Number of patients with undiagnosed diseases in Japan who would be referred to IRUD (cases)
Pediatrics/pediatric surgery Pediatrics 85.6% 125 2.1 1272 2306
Pediatric surgery 73.9% 23 0.3 409 82
Other departments Neurology 100.0% 47 1.5 741 1123
General internal/family medicine 100.0% 29 0.7 625 453
Dermatology 96.4% 55 0.6 786 425
Rheumatology 93.5% 46 0.7 786 523
Otorhinolaryngology 90.5% 21 0.8 1079 771
Gastroenterology 85.0% 60 0.3 1532 403
Pulmonology 84.1% 44 0.4 812 258
Orthopedics 80.0% 45 0.2 1329 266
Hematology 73.0% 37 0.7 623 301
Cardiology 71.9% 64 0.5 1170 457
Diabetes and metabolism 71.1% 45 0.6 858 362
Nephrology 68.4% 38 0.9 770 461
Gastrointestinal surgery 56.5% 23 0.1 1485 65
Others 59.1% 137 0.2 17,153 2106
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