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Nonlinear associations between SII concentration and the prevalence of CI-AKI. When the SII concentration was greater than 653.73×109/L, the prevalence of CI-AKI increased with SII concentration. When the SII concentration was less than 653.73×109/L, the prevalence of CI-AKI reached a plateau.
Abbreviations: RCS, restricted cubic spline; SII, systemic immune-inflammation index; CI-AKI, contrast-induced acute kidney injury.
