STAT Mortality Category (STS-EACTS) Calculator

STAT Mortality Categories (STS–EACTS): Explanation and clinical context The STAT (Society of Thoracic Surgeons – European Association for Cardio-Thoracic Surgery) Mortality Scores and Categories are an empirically derived, procedure-based stratification system for congenital and pediatric cardiac surgery. Each index operation is assigned a numeric STAT score (range ~0.1–5.0) derived from large STS/EACTS registry data; operations are then grouped into five STAT Mortality Categories (Category 1 = lowest operative mortality risk; Category 5 = highest operative mortality risk). A common practical approach is: map the primary operation to its published STAT score from the STS procedure table, then convert that score to the STAT Category using the published score bins (0.1–0.99 → Category 1; 1.0–1.99 → Category 2; 2.0–2.99 → Category 3; 3.0–3.99 → Category 4; ≥4.0 → Category 5).

Category-level benchmark mortality rates evolve over time and differ by era, region, and case mix; contemporary aggregated benchmarks (example era averages) are shown in the calculator output above and should be interpreted as population-level references, not patient-specific predictions. For rigorous risk adjustment or center benchmarking, use procedure-level STAT scores combined with validated multivariable risk models (STS CHSD risk model) and procedural harvests from the STS/EACTS datasets; the STAT Categories were designed to improve discrimination compared with previous consensus methods (e.g., RACHS-1, Aristotle) and to allow case-mix standardization across centers.