TABLE 4.

Multivariable competing risk regression analysis of clinical factors and osteoradionecrosis

	Induction chemotherapy		No induction chemotherapy
Variable	HR (95% CI)	P	HR (95% CI)	P
Hypomagnesemia during treatment course
No	Reference
Yes	2.72 (1.06–6.97)	.037	0.93 (0.54–1.62)	.81
Radiation dose	1.07 (0.95–1.20)	.260	0.98 (0.91–1.06)	.66
Smoking
No	Reference
Yes	2.05 (0.98–4.29)	.056	1.17 (0.67–2.05)	.58
Tumor (T classification)a
Tx, T0 or T1	Reference
T2			1.74 (0.66–4.59)	.260
T3			2.38 (0.85–6.68)	.099
T4			2.78 (1.01–7.64)	.047

Note: The values marked in bold italics indicate statistical significance (P < .05).

Abbreviations: CI, confidence interval; HR, hazard ratio.

^aIn no induction group only.