Table A1.

Distribution of Risk Factors Over 2002-2006 Study Time Period

Risk Factor	2002-2006, EBRT		2002-2006, IMRT		P
	No.	%	No.	%
Age > 50 years	37	67.3	52	69.3	.850
High grade	44	80	63	84	.644
Tumor size > 10 cm	17	31	37	49	.047
Deep	53	96.4	69	92	.466
Close/positive margin	25	45.5	38	51	.597

Abbreviations: EBRT, conventional external-beam radiation therapy; IMRT, intensity-modulated radiation therapy.