Table 2.

Multivariate analysis of the factors influencing distant bone metastases

Clinical factors	Distant bone metastases
	RR (95% CI)	P-value
T-staging	0.978 (0.530–1.806)	0.944
N-staging	1.436 (0.950–2.173)	0.086
Chemotherapy	0.936 (0.404–2.167)	0.878
Skull base bone destruction	2.478 (1.146–5.358)	0.021

Abbreviations: RR, relative risk; CI, confidence interval.