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Table 2 Predicted and observed 5-year overall survival rates of the different subgroups of patients

From: External validity of a prognostic nomogram for locoregionally advanced nasopharyngeal carcinoma based on the 8th edition of the AJCC/UICC staging system: a retrospective cohort study

Group No. of patients (%) No. of deaths 5-year overall survival rate (%) P*
Predicted (%, SE) Observed (%, SE) Predicted-observed (%, 95% CI)
Overall 535 (100.0) 74 78.46 (0.54) 87.29 (1.53) − 8.82 (− 9.88 to − 7.77) < 0.001
Low-risk (< 135) 231 (43.2) 16 88.04 (0.17) 94.92 (1.50) − 6.88 (− 7.22 to − 6.53) < 0.001
Intermediate-risk (135–160) 165 (30.8) 25 79.38 (0.24) 86.72 (2.80) − 7.34 (− 7.81 to − 6.87) < 0.001
High-risk (≥ 160) 139 (26.0) 33 61.46 (0.97) 75.02 (3.99) − 13.56 (− 15.48 to − 11.63) < 0.001
  1. SE standard error, CI confidence interval
  2. * One-sample t test