Table 2.

Results of univariate and multivariable Cox proportional regression analysis of age group, tumor size, EOR, and PORT in the entire study population.

	Univariate Analysis		Multivariable Analysis
	HR (95% CI)	P-value	HR (95% CI)	P-value
Age
<65 years	1 [Reference]		1 [Reference]
≥65 years	2.73 (1.57–4.74)	3.56 × 10−4†	3.41 (1.86–6.23)	6.81 × 10−5†
Size
≤4.9cm	1 [Reference]		1 [Reference]
>4.9cm	1.77 (1.04–3.04)	0.036†	1.78 (1.01–3.16)	0.048†
Extent of resection
GTR	1 [Reference]		1 [Reference]
Biopsy	2.62 (1.29–5.31)	0.007†	3.03 (1.43–6.44)	0.004†
STR	1.40 (0.77–2.53)	0.262	1.23 (0.67–2.27)	0.497
PORT
No/Unknown	1 [Reference]		1 [Reference]
Beam radiation	1.29 (0.81–2.38)	0.235	0.81 (0.44–1.49)	0.503

^†P < 0.05, statistically significant.

EOR, extent of surgery; GTR, gross total resection; STR, subtotal resection; PORT, postoperative radiotherapy.