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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Head Neck. 2019 Feb 18;41(4):857–864. doi: 10.1002/hed.25336

Table 3.

C-indices calculated for OS, LRRFS, and DRFS using AJCC 7th vs. 8th Ed. clinical staging criteria.

AJCC 7th Ed. AJCC 8th Ed.
OS 0.57 0.63
LRRFS 0.54 0.53
DRFS 0.60 0.65

Higher C-index value indicates improved discriminating ability.