Table 3. Two-by-two table for Chi-square test for analysis of CO on TTE and CO measured using electrical cardiography (ICON).

ICON TTE → ↓	Low CO	Normal CO	Total
Low CO	12	13	25
Normal CO	8	16
Total	20	21	41

Abbreviations: CO, cardiac output; TTE, transthoracic echocardiography.