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Table 4 Concordance indexes of different staging systems in different periods for malignant IPMN

From: A novel staging system and clinical predictive nomogram for more accurate staging and prognosis of malignant pancreatic intraductal papillary mucinous neoplasms: a population-based study

Stage system 2000–2004 (n = 345) 2005–2007 (n = 370) 2008–2010 (n = 408) 2011–2013 (n = 421) 2014–2016 (n = 457)
AJCC 7th 0.688 (0.673–0.703) 0.773 (0.761–0.785) 0.763 (0.749–0.777) 0.78 (0.766–0.794) 0.807 (0.791–0.823)
AJCC 8th 0.707 (0.691–0.723) 0.769 (0.757–0.781) 0.761 (0.747–0.775) 0.778 (0.764–0.792) 0.806 (0.790–0.822)
AJCC modified 0.69 (0.675–0.705) 0.774 (0.762–0.786) 0.765 (0.751–0.779) 0.78 (0.766–0.794) 0.807 (0.791–0.823)