TABLE 3.

Multivariate Cox Proportional Hazard Models of Local Regional Recurrence Among Patients Who Did and Did Not Undergo Radiation Therapy^*

Variable	Hazard Ratio	95% Confidence Interval	P Value
Radiation therapy
Age, yrs
>40	1.00 (reference)
≤40	2.72	1.05–7.06	0.04
Margin width
Free (≥2 mm)	1.00 (reference)
Close (<2 mm)	0.77	0.19–3.23	0.72
No radiation therapy
Age, yrs
>40	1.00 (reference)
≤40	2.08	0.48–9.08	0.33
Margin width
Free (≥2 mm)	1.00 (reference)
Close (<2 mm)	5.49	1.79–16.88	0.003

^*Variables in the model included: age, radiation therapy, margin width.