Table 1. Clinical characteristics of the patient population.

Characteristic	All Patients	Low-grade	High-grade	P value
n	18	9 (50%)	9 (50%)
Age (years)	51±21	44±23	56±19	0.27
Sex				0.64
Female	10 (56%)	4 (44%)	6 (67%)
Male	8 (44%)	5 (56%)	3 (33%)
Tumor location				1.00
Parotid	7 (39%)	3 (33%)	4 (44%)
Minor	11 (61%)	6 (67%)	5 (56%)
Tongue	4 (22%)	3 (33%)	1 (11%)
Palate	3 (17%)	1 (11%)	2 (22%)
Floor of mouth	1 (6%)	0 (0%)	1 (11%)
Mandible	1 (6%)	1 (11%)	0 (0%)
Tonsillar	1 (6%)	1 (11%)	0 (0%)
Retromolar trigone	1 (6%)	0 (0%)	1 (11%)
Recurrent tumor	4 (22%)	0 (0%)	4 (44%)	0.02

Numerical data are mean ± standard deviation.