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Percentage change in discrimination in external validations of valvular heart disease clinical prediction models, stratified by relatedness. Each bar represents a unique external validation that reports a c‐statistic (n=205). Society of Thoracic Surgeons (2009) Models. Percentage change in discrimination is calculated as ([validation c‐statistic–0.5]–[derivation c‐statistic–0.5])/[derivation c‐statistic–0.5]×100. STS indicates Society of Thoracic Surgeons
