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FROC curves arranged by grade. FROC curves of system performance for Genant fracture severity grade 1 (<25%), grade 2 (26%–40%), and grade 3 (>40%). The performance difference between grade 1 and grade 3 classification is significant (P = .05), while performance differences between grades 2 and 3 (P = .12) and between grades 1 and 2 (P = .64)
