Table 1.

An overview of the datasets used in this study.

data source	no. of recordings	sampling frequency (Hz)	length (s)	annotations (recordings of a label/total recordings)
China Physiological Signal Challenge 2018 (CPSC 2018) [18]	6877 (female: 3178; male: 3699)	500 Hz	6–60	normal (918/6877);
				atrial fibrillation (AF) (1221/6877);
				first-degree atrioventricular block (I-AVB) (722/6877);
				left bundle branch block (LBBB) (236/6877);
				right bundle branch block (RBBB) (1857/6877);
				premature atrial contraction (PAC) (616/6877);
				premature ventricular contraction (PVC) (700/6877);
				ST-segment depression (STD) (869/6877);
				ST-segment elevated (STE) (220/6877)
PhysioNet/CinC 2020 [19,20]	3998 (female: 1895; male: 2103)	500 Hz	10	normal (1752/3998);
				atrial fibrillation (AF) (487/3998);
				atrioventricular block (AVB) (709/3998);
				bundle branch block (BBB) (258/3998);
				ST-segment changes (STC) (1044/3998)