Table 4 Relative amplitude and low and high frequency limits of systolic murmur
From: Phono-spectrographic analysis of heart murmur in children
Group | Amplitude (%) | Low freq limit (Hz) | High freq limit (Hz) |
|---|---|---|---|
Vibratory | 23 ± 9 | 72 ± 15 | 161 ± 22 |
Ejection | 20 ± 9 | 60 ± 9 | 142 ± 51 |
Pathological | 30 ± 20 | 52 ± 19 | 299 ± 133 |
p-value | 0.013 | < 0.001 | < 0.001 |