Table 2 Risk-adjusted odds ratios for undergoing right hemicolectomy rather than appendectomy associated with select patient, facility, and tumor characteristics

Age

p = 0.784

p = 0.522

p = 0.006

p = 0.031

  < 65

Ref

-

Ref

-

Ref

-

Ref

-

  ≥ 65

1.0 (0.8, 1.4)

0.784

1.1 (0.9, 1.2)

0.522

1.3 (1.1, 1.6)

0.006

0.8 (0.7, 1.0)

0.031

Charlson-Deyo Score

0.061

0.806

0.003

0.082

 0

Ref

-

Ref

-

Ref

-

Ref

-

 1

1.3 (1.0, 1.7)

0.055

1.0 (0.9, 1.2)

0.876

1.3 (1.1, 1.5)

0.008

1.2 (1.0, 1.4)

0.068

  ≥ 2

1.4 (0.9, 2.3)

0.107

1.1 (0.8, 1.4)

0.514

1.4 (1.1, 1.9)

0.012

0.9 (0.7, 1.1)

0.325

Year of Diagnosis

0.381

0.033

0.081

0.015

 2004–2010

Ref

-

Ref

-

Ref

-

Ref

-

 2011–2017

1.1 (0.8, 1.5)

0.381

0.9 (0.7, 1.0)

0.033

0.8 (0.7, 1.0)

0.081

0.8 (0.7, 1.0)

0.015

Facility Type

0.282

0.054

 < 0.001

0.186

 Community

Ref

-

Ref

-

Ref

-

Ref

-

 Comprehensive Community

1.2 (0.9, 1.6)

0.297

0.8 (0.7, 1.1)

0.128

1.0 (0.7, 1.2)

0.699

0.9 (0.7, 1.1)

0.259

 Academic/Research

1.4 (1.0, 2.0)

0.052

1.0 (0.8, 1.3)

0.957

1.1 (0.8, 1.4)

0.624

1.0 (0.8, 1.3)

0.765

 Integrated Network

1.1 (0.7, 1.5)

0.772

0.9 (0.6, 1.1)

0.246

0.8 (0.6, 1.0)

0.092

0.8 (0.6, 1.1)

0.190

 Unknown facility type or location^a

1.2 (0.7, 2.1)

0.450

0.9 (0.6, 1.2)

0.392

0.5 (0.4, 0.7)

 < 0.001

1.0 (0.7, 1.5)

0.995

Facility Location

0.037

0.012

 < 0.001

0.001

 Northeast

Ref

-

Ref

-

Ref

-

Ref

-

 Midwest

0.8 (0.6, 1.1)

0.280

1.3 (1.1, 1.5)

0.006

1.2 (1.0, 1.5)

0.034

1.1 (0.9, 1.3)

0.515

 South

0.8 (0.6, 1.0)

0.063

1.0 (0.9, 1.2)

0.817

0.9 (0.8, 1.1)

0.377

1.0 (0.8, 1.2)

0.917

 West

0.6 (0.4, 0.9)

0.005

1.0 (0.9, 1.2)

0.985

0.7 (0.6, 0.9)

0.004

0.7 (0.6, 0.9)

0.003

AJCC Stage

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 1

Ref

-

Ref

-

Ref

-

Ref

-

 2

1.5 (1.2, 2.0)

 < 0.001

1.2 (0.9, 1.4)

0.163

4.2 (3.6, 5.0)

 < 0.001

1.1 (0.9, 1.3)

0.337

 3

3.4 (2.2, 5.4)

 < 0.001

1.6 (1.2, 2.1)

 < 0.001

6.8 (5.6, 8.4)

 < 0.001

1.6 (1.3, 2.1)

 < 0.001

 4

1.7 (1.1, 2.6)

0.013

1.0 (0.8, 1.2)

0.687

3.1 (2.4, 4.0)

 < 0.001

1.1 (0.9, 1.4)

0.341

 0

0.4 (0.1, 2.2)

0.279

0.5 (0.4, 0.8)

0.002

0.9 (0.1, 5.9)

0.940

0.4 (0.3, 0.6)

 < 0.001

Grade

0.163

 < 0.001

0.160

0.097

 Well Differentiated

Ref

-

Ref

-

Ref

-

Ref

-

 Moderately Differentiated

1.3 (0.9, 1.8)

0.110

1.3 (1.2, 1.5)

 < 0.001

1.3 (1.0, 1.6)

0.032

1.2 (1.0, 1.5)

0.022

 Poorly Differentiated

1.4 (1.0, 2.1)

0.084

1.4 (1.2, 1.7)

 < 0.001

1.2 (0.9, 1.5)

0.241

1.2 (1.0, 1.5)

0.087

 Unknown

1.1 (0.8, 1.4)

0.686

1.1 (0.9, 1.3)

0.268

1.0 (0.9, 1.2)

0.676

1.0 (0.8, 1.3)

0.920

Lymphovascular Invasion

0.993

 < 0.001

 < 0.001

0.051

 Absent

Ref

-

Ref

-

Ref

-

Ref

-

 Present

1.0 (0.8, 1.3)

0.910

1.3 (1.1, 1.5)

0.012

1.5 (1.3, 1.8)

 < 0.001

1.2 (1.0, 1.4)

0.140

 Unknown

1.0 (0.8, 1.3)

0.962

0.8 (0.7, 1.0)

0.010

1.1 (0.9, 1.2)

0.457

0.9 (0.7, 1.1)

0.153