Table 2.

MR etiology by expanded grade

Variable	Severe		Massive		Torrential		Total		P-value
	N	Percentage	N	Percentage	N	Percentage	N	Percentage
Primary	57	57/84 (68%)	27	27/33 (82%)	25	25/25 (100%)	109	109/142 (77%)	0.008
Mixed	18	18/84 (21%)	2	2/33 (6%)	0	0/25 (0%)	20	20/142 (14%)
Secondary	9	9/84 (11%)	4	4/33 (12%)	0	0/25 (0%)	13	13/142 (9%)

Notes. Bolded values were found to be statistically significant differences between compared groups.

Abbreviation: MR, mitral regurgitation.

∗P-values were calculated by X² test for categorical variables.