Table 1.

Statistical Analysis of the Correlation Between Dosimetric Quantities and Toxicity Grades.^a

	CT1 (Planning CT)		CT2 and CT3 (Follow-Up CTs)
	Correlation	P Value	Correlation	P Value
V20	0.09	.68	0.14	.50
V60	0.37	.08	0.48	.02
Dmax	−0.03	.90	−0.11	.60
EUD	0.22	.29	0.25	.24
NTCP	0.27	.21	0.36	.08

Abbreviations: Dmax, maximum esophageal dose; EUD, equivalent uniform dose; NTCP, normal tissue complication probability.

^a The statistical correlation and the corresponding P value are summarized for CT1 (planning CT) and CT2 and CT3 (follow-up CTs), respectively.