Variable
β
SE
p
GTV volume (cc)
-0.03
0.009
<0.01
PTV volume (cc)
-0.013
0.004
<0.01
Total MU
-0.017
0.006
<0.01
Number of fields
-1.656
0.678
0.02

Abbreviations: SE = standard error; β = change in EUD difference per unit change of the independent variable.

Table 6: Univariate analysis of factors associated with the difference in EUD between the pencil beam (PB) and Monte Carlo (MC) algorithms for the PTV.