Table 2.

Characteristics for Cases of Mucoepidermoid Carcinoma Stratified by Race

	Race/Ethnicity
Variables	White	Black	Hispanic	P Value
Total (N=2,484)	1,871	308	305
Age at Diagnosis (yrs) 3				< 0.0001 1
Mean ± S.D.	56.73 ± 19.01	47.51 ± 18.67	45.04 ± 19.56
Median (I.Q.R)	58 (44 to 71)	47 (35 to 61)	44 (28 to 59)
Gender (%) 3				0.002
Male	53.39	46.75	43.93
Female	46.61	53.25	56.07
Tumor Grade (%) 3 (N=2,203)				< 0.0001
Low Grade	64.42	77.62	83.15
High Grade	35.58	22.38	16.85
Tumor Size at Diagnosis (mm) 3 (N=2,097)				0.001 1
Mean ± S.D.	24.05 ± 16.67	27.11 ± 16.93	24.50 ± 13.95
Median (I.Q.R)	20 (13 to 30)	24 (15 to 33)	21 (15 to 30)
Lymph Nodes (%) 3 (N=2,195)				0.081
No Lymph Node Involvement	76.07	78.99	81.75
Positive Nodes	23.93	21.01	18.25
Radiation (%) 3 (N=2,446)				0.016
Yes	48.16	44.37	39.60
No	51.84	55.63	60.40
Surgery (%) 3 (N=2,482)				0.049
Yes	92.83	95.13	96.07
No	7.17	4.87	3.93
Extension (%) (N=2,369)				0.410 2
Intraglandular	69.62	74.40	73.22
Extraglandular	28.52	24.57	25.42
Metastatic	1.85	1.02	1.36
Diagnosis Year (%)				< 0.0001
1988 to 1995	19.72	19.48	11.15
1996 to 2003	38.05	31.49	27.87
2004 to 2010	42.22	49.03	60.98

¹P values were based on results of Kruskal-Wallis test.

²P values were based on results of Fisher Exact test.

³For continuous and binary categorical variables with a statistically significant difference on race, the results of multiple comparisons between race were summarized as White versus Hispanic (W/H) or/and White versus Black (W/B) or/and Hispanic versus Black (H/B) with p values < 0.05. For age at diagnosis, the differences were W/H and W/B. For tumor size at diagnosis, the difference was W/B. For gender and tumor grade, both were W/H and W/B. For radiation and surgery, both were W/H.

S.D. = standard deviation; I.Q.R. = interquartile range