| Amplitude | X2 | P-value | |||
Normal (N = 48) | Low (N = 12) | |||||
IVH grades | Grade I | 36.25% | 0 | 0% | 12 | <0.001 HS |
Grade II | 3 6.25% | 0 | 0% | |||
Grade III | 0 0% | 6 | 50% |