Table 4.

Characteristics for Cases of Adenoid Cystic Carcinoma Stratified by Race

	Race/Ethnicity
Variables	White	Black	Hispanic	P Value
Total (N=1,278)	977	154	147
Age at Diagnosis (yrs) 3				< 0.0001 1
Mean ± S.D.	56.56 ± 15.82	52.77 ± 15.02	48.10 ± 16.18
Median (I.Q.R)	56 (46 to 69)	51 (42 to 63)	46 (37 to 59)
Gender (%) 3				0.011
Male	42.89	32.47	34.01
Female	57.11	67.53	65.99
Tumor Grade (%)				0.187
Low Grade	14.53	13.64	16.33
High Grade	9.42	9.74	3.40
Unknown	76.05	76.62	80.27
Tumor Size at Diagnosis (mm) 3 (N=1,083)				0.0002 1
Mean ± S.D.	26.77 ± 17.99	30.03 ± 16.49	34.06 ± 25.40
Median (I.Q.R)	23 (15 to 34)	26 (16 to 40)	30 (20 to 40)
Lymph Nodes (%) (N=1,120)				0.750
No Lymph Node Involvement	82.50	85.07	82.17
Positive Nodes	17.50	14.93	17.83
Radiation (%) (N=1,242)				0.219
Yes	74.74	68.46	71.33
No	25.26	31.54	28.67
Surgery (%) (N=1,274)				0.867
Yes	92.29	91.56	93.20
No	7.71	8.44	6.80
Extension (%) (N=1,214)				0.624 2
Intraglandular	54.97	59.86	53.90
Extraglandular	42.44	36.73	42.55
Metastatic	2.59	3.40	3.55
Diagnosis Year (%)				0.223
1988 to 1995	20.47	22.08	14.97
1996 to 2003	36.64	31.17	34.01
2004 to 2010	42.89	46.75	5105

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 the 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, W/B, and H/B. For tumor size at diagnosis, the difference was W/H. For gender, the differences were W/H and W/B.

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