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. Author manuscript; available in PMC: 2013 Apr 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2012 Apr 27;84(4):1017–1023. doi: 10.1016/j.ijrobp.2012.02.020

Table 4.

Multivariate binary logistic regression analysis of risk factors for severe RP

Characteristic P value Relative risk (95% CI) Beta coefficient Assigned score
ECOG PS before SABR .009 10.40 (1.81-59.78) 2.34 1
FEV1 before SABR .012 12.01 (1.72-84.03) 2.49 1
V20 (composite plan) .021 11.58 (1.45-92.42) 2.45 1
Location of previous PTV .025 10.79 (1.35-86.44) 2.38 1

Abbreviations: CI = confidence interval; ECOG PS = Eastern Cooperative Oncology Group performance status; FEV1 = forced expiratory volume in 1 second; PTV = planning target volume; RP = radiation pneumonitis; SABR = stereotactic ablative radiation therapy; V20 = percent volume of lung exposed to at least 20 Gy.