Patient-level age, recorded sex and overlapping ABI code flags describe one representative paired admission per person in each frozen partition. MIMIC: earliest within-person paired admission. eICU: deterministic representative, not certified chronological first. Age capped at90; noninteger quartiles rounded to one decimal in Table1 (full precision in patient_baseline_full.csv). Percentages use all patients in each column. Age was available for all included patients; recorded sex was neither Female nor Male for2 eICU patients and0 MIMIC patients. ABI subtypes overlap and percentages need not sum to100%. Boundary-era MIMIC patients are descriptive only. History availability at any included measurement defines the last row, not availability at the representative admission or at every measurement. Paired stays and measurements enumerate all included records for the column patients. See descriptive_methods_EN.txt for precise index and denominator definitions.