. Author manuscript; available in PMC: 2011 Oct 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Jan 7;78(2):449–453. doi: 10.1016/j.ijrobp.2009.07.1708

Table 2.

Poisson regression analysis for the risk of parotid flow complications one year after RT for Michigan versus Utrecht, corrected for the mean parotid gland dose.

One year post-RT	Crude RR (95% CI)	Adjusted RR (95% CI)^*	p-value^†
Michigan vs Utrecht	1.01 (0.79-1.3)	0.96 (0.78-1.18)	0.68
Mean dose (Gy)		1.05 (1.04-1.06)	<0.0001

Adjusted for mean parotid gland dose (in Gy) on the endpoint parotid flow to <25% of pre-treatment.

^†

p-value for the adjusted RR.

Abbreviation: 95% CI = 95% confidence interval; RR = relative risk.