. Author manuscript; available in PMC: 2019 Mar 8.

Published in final edited form as: World Neurosurg. 2018 Oct 4;121:e640–e646. doi: 10.1016/j.wneu.2018.09.179

Table 4.

Treatment-Related Edema: Multivariable Analysis

	Freedom from TRE (years from XRT)
Covariate	Level	HR (95% CI)	HR P Value	Type 3 P Value
Treatment	FRT	0.04 (0.01–0.20)	<0.001	<0.001
Treatment	SRS	-	-
Location	Base of skull	0.67 (0.29–1.57)	0.359	0.359
Location	Other	-	-
Lesion size (average)		1.01 (0.98–1.05)	0.473	0.473

XRT, radiation therapy; TRE, treatment-related radiographic edema; HR, hazard ratio; CI, confidence interval; FRT, fractionated radiation therapy; SRS, stereotactic radiosurgery.

Number of observations in the original data set was 211, and the number of observations used was 181.

^†

Backward selection with an alpha level of removal of 0.05 was used. No variables were removed from the model.