TABLE 3.

Univariate 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	2.98 (1.15–7.68)	.024	0.94 (0.54–1.62)	.82
Radiation dose	1.09 (0.97–1.22)	.15	0.99 (0.92–1.06)	.70
Dental extraction
No	Reference
Yes	1.20 (0.62–2.32)	.59	1.29 (0.85–1.95)	.24
Tumor (T classification)
Txa, T0 or T1
T2	1.66 (0.35–7.84)	.52	1.65 (0.63–4.35)	.31
T3	1.55 (0.34–7.10)	.57	2.15 (0.79–5.85)	.13
T4	2.57 (0.60 10.95)	.20	2.74 (1.00–7.46)	.049
Alcohol use
No	Reference
Yes	1.34 (0.67–2.65)	.41	1.00 (0.58–1.71)	1.00
Smoking
No	Reference
Yes	2.15 (1.03–4.48)	.041	1.14 (0.68–1.93)	.62

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

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

^aTx refers no primary tumor.