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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