Derivation and Validation of a Nomogram to Predict In‐Hospital Complications in Children with Tetralogy of Fallot Repaired at an Older Age

Background We aimed to develop and validate a prediction model for in‐hospital complications in children with tetralogy of Fallot repaired at an older age. Methods and Results A total of 513 pediatric patients from the Tianjin data set formed a derivation cohort, and 158 pediatric patients from the Hefei and Xiamen data sets formed validation cohorts. We applied least absolute shrinkage and selection operator analysis for variable selection and...