MederiScore Public Dataset v2 — Cardiac Surgery Mortality at High Altitude (Bogotá, Colombia, 2,600 m asl)

De-identified cardiac surgery dataset (N=1,486; 117 in-hospital deaths, 7.9%) from Hospital Universitario Mayor-Méderi, Bogotá, Colombia (2,600 m asl), 2019–2026. Supports two companion manuscripts: (1) MederiScore — development and internal validation of a logistic regression mortality model (AUC 0.834); (2) External validation of EuroSCORE II, Additive EuroSCORE, and STS PROM v2.9 — first validation of these scores in a population permanently residing at ≥2,500 m asl. Dataset includes 52 variables, four predicted probability columns, and a fully reproducible Python analysis script. Online calculator: https://drrodriguezl.github.io/mederiscore/