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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