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Observed frequencies vs. model-predicted 5-year survival in 10 risk groups. Risk groups 1–10 represent risk scores 0.7–26.4, 26.4–49.0, 49.0–64.5, 64.5–72.5, 72.5–79.7, 79.7–86.1, 86.1–90.9, 90.9–93.8, 93.8–95.9 and 95.9–99.6, respectively.
