Table 5.

Characteristics for Cases of Squamous Cell Carcinoma Stratified by Race

	Race/Ethnicity
Variables	White	Black	Hispanic	P Value
Total (N=2,125)	1,863	117	145
Age at Diagnosis (yrs) 3				< 0.0001 1
Mean ± S.D.	72.00 ± 13.28	61.40 ± 15.11	67.99 ± 14.94
Median (I.Q.R)	74 (63 to 82)	62 (50 to 72)	70 (60 to 77)
Gender (%) 3				0.0004
Male	78.26	63.25	72.41
Female	21.74	36.75	27.59
Tumor Grade (%)				0.244
Low Grade	32.85	23.08	35.17
High Grade	40.69	47.86	40.00
Unknown	26.46	29.06	24.83
Tumor Size at Diagnosis (mm) 3 (N=1,520)				< 0.0001 1
Mean ± S.D.	35.26 ± 19.73	56.36 ± 102.44	43.32 ± 28.11
Median (I.Q.R)	30 (20 to 45)	45 (30 to 60)	38 (20 to 58)
Lymph Nodes (%) 3 (N=1,785)				0.016
No Lymph Node Involvement	51.09	36.89	53.33
Positive Nodes	48.91	63.11	46.67
Radiation (%) 3 (N=2,060)				0.849
Yes	64.25	66.37	62.94
No	35.75	33.63	37.06
Surgery (%) 3 (N=2,109)
Yes	76.94	57.26	74.48	< 0.0001
No	23.06	42.74	25.52
Extension (%) (N=1,875)
Intraglandular	42.08	35.24	37.50	0.162 2
Extraglandular	54.38	57.14	57.81
Metastatic	3.53	7.62	4.69
Diagnosis Year (%)				0.016
1988 to 1995	14.92	14.53	15.17
1996 to 2003	35.53	37.61	22.07
2004 to 2010	49.54	47.86	62.76

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

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