Table 5 Correlation between β constant at 24, 48 and 72 hours with late toxicity. Simple Cox regression analysis. p value, Exp(B) and C.I. 95% were included. *: grades 0 vs. 1-4, #: grades 0-2 vs. 3-4

β24

p = 0.073

0.916

(0.832-1.008)

p = 0.063

0.908

(0.821-1.005)

p = 0.021

0.835

(0.717-0.973)

p = 0.007

0.834

(0.730-0.951)

β48

p = 0.071

0.914

(0.830-1.008)

p = 0.026

0.897

(0.816-0.987)

p = 0.053

0.855

(0.729-1.002)

p = 0.001

0.884

(0.828-0.944)

β72

p = 0.834

0.984

(0.843-1.147)

p = 0.013

0.951

(0.913-0.989)

p = 0.376

0.946

(0.837-1.069)

p = 0.026

0.935

(0.882-0.992)