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