Risk Evaluation of Azithromycin-Induced QT Prolongation in Real-World Practice

Figure 1

Overview of the study process. Among the 816,421 ECG results, 402,607 ECGs which have no duplicated or repeated measurements, no outlier, and potassium (K⁺) and calcium (Ca⁺) results within one-year before ECG measurement were enrolled and divided into QT prolongation case (n=62,007) vs. control (n=340,600) or severe QT prolongation case (n=9,353) vs. control (n=393,254).