Table 1

Schedule of data collection

Research stage	Class of patients	Sample size
Stage 1: building the training data set for the classifier (15 March 2023–15 September 2024)	No MR	161
	Mild MR	161
	Moderate MR	107
	Severe MR	108
	Total	537
Stage 2: independent clinical validation (16 September 2024–15 March 2025)	No MR	86
	Mild MR	86
	Moderate MR	57
	Severe MR	57
	Total	286
Total		823

MR, mitral regurgitation.