Table 1 Patient demographics and baseline characteristics.

Age

< 0.001

0.685

≤ 60 years

4,055 (69%)

3,325 (65%)

2,911 (66%)

2,893 (66%)

-0.009

>60 years

1,814 (31%)

1,820 (35%)

1,486 (34%)

1,504 (34%)

0.009

Marital status

0.882

0.179

Married

3,503 (60%)

3,078 (60%)

2,572 (58%)

2,634 (60%)

0.029

Unmarried

2,366 (40%)

2,067 (40%)

1,825 (42%)

1,763 (40%)

-0.029

Median household income

< 0.001

0.369

<75,000 USD

2,836 (48%)

2,268 (44%)

1,985 (45%)

2,027 (46%)

0.019

≥ 75,000 USD

3,033 (52%)

2,877 (56%)

2,412 (55%)

2,370 (54%)

-0.019

Place of residence

< 0.001

0.250

Urban

5,117 (87%)

4,596 (89%)

3,923 (89%)

3,889 (88%)

-0.025

Rural

752 (13%)

549 (11%)

474 (11%)

508 (12%)

0.025

Race

< 0.001

0.085

Black

338 (6%)

329 (6%)

278 (6%)

292 (7%)

0.013

White

4,924 (84%)

4,141 (80%)

3,558 (81%)

3,478 (79%)

-0.046

Other

607 (10%)

675 (13%)

561 (13%)

627 (14%)

0.044

Ethnicity

0.013

0.499

Hispanic

781 (13%)

604 (12%)

540 (12%)

561 (13%)

0.015

Non-Hispanic

5,088 (87%)

4,541 (88%)

3,857 (88%)

3,836 (87%)

-0.015

Histological grade

< 0.001

0.003

Well differentiated; Grade I

4,939 (84%)

3,397 (66%)

3,467 (79%)

3,351 (76%)

-0.056

Moderately differentiated; Grade II

930 (16%)

1,748 (34%)

930 (21%)

1,046 (24%)

0.056

Tumor size

< 0.001

0.304

≤ 2 cm

2,102 (36%)

1,331 (26%)

1,247 (28%)

1,271 (29%)

0.012

>2 cm

1,350 (23%)

1,765 (34%)

1,333 (30%)

1,379 (31%)

0.022

Unknown

2,417 (41%)

2,049 (40%)

1,817 (41%)

1,747 (40%)

-0.033

Radiotherapy

< 0.001

0.004

Yes

75 (1%)

134 (3%)

63 (1%)

99 (2%)

0.051

No/Unknown

5,794 (99%)

5,011 (97%)

4,334 (99%)

4,298 (98%)

-0.051

Chemotherapy

< 0.001

0.105

Yes

11 (0%)

41 (1%)

11 (0%)

20 (0%)

0.023

No/Unknown

5,858 (100%)

5,104 (99%)

4,386 (100%)

4,377 (100%)

-0.023