Table 3.

Chi-square analysis of diastolic dysfunction across the groups (using 2 x Y contingency table)

Group	A/E ratio ≥ 1	A/E ratio < 1	Total
Normal	12	23	35
Mild	26	9	35
Moderate	28	7	35
Severe	33	2	35
Total	99	41	140

X² (Odds Ratio) =33.49

Df =3

P Value = 0.00000025

Statistically significant? Yes (P < 0.0001)

A/E = Diastolic dysfunction index