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Table 2: Univariate Cox regression analysis for OPP-free survival
Variable HR P Value 95% CI Comment
Age 1.16 .01 1.03–1.30 Continuous
Radiation dose 0.86 .1 0.72–1.03 Continuous
Tumor radiosensitivity 0.70 .7 0.12–4.17 Radiosensitive vs -resistant
Location 0.75 .8 0.13–4.48 T-spine vs C/L-spine
Fraction – – – Collinearity (all OPP occurred in single-fraction regimens)
Note:—HR indicates hazard ratio; C/L, cervical/lumbar; –, not applicable.

Variable	HR	P Value	95% CI	Comment
Age	1.16	.01	1.03–1.30	Continuous
Radiation dose	0.86	.1	0.72–1.03	Continuous
Tumor radiosensitivity	0.70	.7	0.12–4.17	Radiosensitive vs -resistant
Location	0.75	.8	0.13–4.48	T-spine vs C/L-spine
Fraction	–	–	–	Collinearity (all OPP occurred in single-fraction regimens)