Table 2.

Mean and standard deviation of the differences between achieved and predicted dose-volume parameters for lung before and after implementation of model. The minimum achievable values for each dose-volume parameter were predicted prior to plan optimisation using Eclipse Scripting Application Plugg-In (ESAPI)

Dose-volume parameter	Before model		After model		p value
	Mean	SD	Mean	SD
V5	10.8 %	7.1 %	5.9 %	4.6 %	0.007
V20	4.0 %	3.1 %	2.7 %	2.1 %	0.038
Mean lung dose (MLD)	2.5 Gy	1.6 Gy	1.6 Gy	1.0 Gy	0.012