All patients younger than 18 years were excluded, as were those admitted to preoperative elective surgery whose stay was presumed to be less than 48 hours. These patients were excluded due to their low severity scores and their relatively short stay in the ICU and in the hospital.
Se excluyeron todos los pacientes menores de 18 años, y aquellos ingresados en el preoperatorio de cirugía electiva cuya estadía se presumía sería menor a 48 horas, debido a sus bajos scores de severidad, así como su reducida estadía en UCI y en el hospital.