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Table 2 Normal tissue complication probability fitted parameters

From: Normal tissue complication probability modeling for cochlea constraints to avoid causing tinnitus after head-and-neck intensity-modulated radiation therapy

NTCP model TD 50 , Gy (95 % CI) γ50 or m (95 % CI) TD 20 , Gy (95 % CI)
Logistic 46.31 (41.46–52.50) 1.27 (1.02–1.55) 33.62 (30.15–38.27)
LKB 46.52 (41.91–53.43) 0.35 (0.30–0.42) 32.82 (29.58–37.69)
  1. Abbreviation: CI confidence interval, NTCP normal tissue complication probability, LKB Lyman-Kutcher-Burman, TD 50 the dose predicting a 50 % risk of complications, TD 20 the dose predicting a 20 % risk of complications, m a unitless LKB model parameter for describing the slope of the dose–response curve, γ 50 a Logistic model parameter for normalized slope of the dose–response curve
  2. The CIs were calculated by fixing one parameter at its best-fit value and allowing the other parameter to vary