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. 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
SRS - -
Location Base of skull 0.67 (0.29–1.57) 0.359 0.359
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.