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Table 2 Assignment of Recursive Partitioning Analysis (RPA) Groups

From: Risk groups defined by Recursive Partitioning Analysis of patients with colorectal adenocarcinoma treated with colorectal resection

RPA class

Definition (s)

Patients

Events

Group 1 (mild risk)

stage I colorectal cancer and age < 76.1 years,

1,698

119

Group 2 (moderate risk)

stage II colorectal cancer, age < 76.1 years and LN examined > = 6

stage III colorectal cancer, CCI < 2

3,129

449

Group 3 (high risk)

stage I & II colorectal cancer, age ≥ 76.1 years

stage II colorectal cancer, age < 76.1 years and LN examined < 6

stage III colorectal cancer, CCI > = 2, with chemotherapy

4,605

1,502

Group 4 (very high risk)

stage III colorectal cancer, CCI > = 2, without chemotherapy

1,062

525

  1. RPA: recursive partitioning analysis; CCI: Charlson comorbidity index; LN: lymph node