E/A Ratio | Patients group (No. = 300) | Control group (No. = 20) | Chi-square test | |||
No. | % | No. | % | X2 | P-value | |
Normal | 180 | 60.0% | 20 | 100.0% | 11.429 | 0.001 |
Reversed | 120 | 40.0% | 0 | 0.0% |