Table 7. Estimates from a multiple linear regression model for age, adjusting for gender, ethnicity (all patients), grade, tumor location and histology type among patients Stages I,II,III disease.

Age difference(years): Stages I,II,III	All patients n = 34845	Caucasian n = 28657	African-American n = 3322	Asian n = 2866
Adjusted mean age(years)
tumor ≤ 1 cm	68.83(68.77~68.9)	69.52(69.48~69.55)	66.04(65.76~66.32)	65.17(65.03~65.31)
1~2 cm vs. ≤ 1 cm	0.06(−0.01~0.13), p = 0.096	0.02(−0.01~0.07),P = 0.256	−0.005(−0.31~0.30),p = 0.974	0.37(0.2~0.53), p < 0.001
2~3 cm vs. ≤ 1 cm	0.13(0.05~0.21), p = 0.001	0.1(0.06~0.15), p < 0.001	0.18(−0.15~0.52), p = 0.282	0.69(0.52~0.87), p < 0.001
3~4 cm vs. ≤ 1 cm	0.34(0.26~0.43), p < 0.001	0.29(0.24~0.35), p < 0.001	0.67(0.30~1.04), p < 0.001	1.13(0.94~1.32), p < 0.001
4~5 cm vs. ≤ 1 cm	0.59(0.49~0.68), p < 0.001	0.47(0.41~0.53), p < 0.001	0.85(0.47~1.25), p < 0.001	1.28(1.06~1.51), p < 0.001
5~6 cm vs. ≤ 1 cm	0.73(0.64~0.83), p < 0.001	0.56(0.50~0.62), p < 0.001	1.17(0.75~1.60), p < 0.001	1.69(1.41~1.9), p < 0.001
6~7 cm vs. ≤ 1 cm	0.85(0.72~0.91), p < 0.001	0.68(0.61~0.75), p < 0.001	1.24(0.81~1.67), p < 0.001	1.76(1.63~2.17), p < 0.001
7~8 cm vs. ≤ 1 cm	0.76(0.64~0.88), p < 0.001	0.70(0.64~0.75), p < 0.001	1.49(1.03~1.95), p < 0.001	1.81(1.49~2.11), p < 0.001
>8 cm vs. ≤ 1 cm	0.85(0.64~0.89), p < 0.001	0.79(0.71~0.85), p < 0.001	1.40(0.94~1.86), p < 0.001	1.79(1.41~2.16), p < 0.001

Values given are mean differences in ages by tumor size and stage of disease, with 95%CIs.