Fraction of patients (i.e., cumulative incidence) diagnosed with head and neck cancer who have died from that cancer as a function of time since diagnosis for a) age at diagnosis, b) sex, and c) race. Time-dependent hazard ratios (eβ(t)x) for cancer death for d) age at diagnosis, e) sex, and f) race in multivariable models (adjusting for sex, race, year of diagnosis, and anatomical site) stratified by tumor stage. The ribbons in all plots represent 95% confidence intervals for the estimate; confidence intervals for the cumulative incidence plots may be obscured by line thickness.