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84 (95% CI, 0.73-0.94), and the calibration plot showed a good fitting between prediction and observation. We established a useful nomogram based on CTA imaging, which showed a satisfied efficacy for evaluating risk of CBS in HNC patients preoperatively. We established a useful nomogram based on CTA imaging, which showed a satisfied efficacy for evaluating risk of CBS in HNC patients preoperatively. Several tests are available to assess the different components of physical fitness, including cardiorespiratory fitness, muscular strength, and flexibility. How