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The aim of this study is to quantify the variation of the T-wave morphology during a 24-hour electrocardiogram (ECG) recording. Two ECG-derived markers are presented to quantify T-wave morphological variability in the temporal, d w , and amplitude, d a , domains. Two additional markers, d NL w and d NL a , that only capture the non-linear component of d w and d a are also proposed. The proposed markers are used to quantify Twave time and amplitude variations in 500 24-hour ECG recordings fromdoi:10.1007/978-981-10-5122-7_120 fatcat:7nil5mqq5fhbfadxoq52ge5tcm