Nonlinear Analysis of Auscultation Signals in TCM Using the Combination of Wavelet Packet Transform and Sample Entropy

Table 4

SampEn values for the subbands’ coefficients in the fourth level with significant differences.

Frequency band (kHz)	Qi deficiency		Yin deficiency		Healthy		P value
	mean	SD	mean	SD	mean	SD
0.5–1	1.240	0.220	1.276	0.289	1.397	0.293	0.005
1–1.5	1.284	0.263	1.334	0.310	1.434	0.324	0.029
1.5–2	1.238	0.307	1.246	0.352	1.431	0.303	0.021
2.5–3	1.346	0.290	1.392	0.342	1.544	0.287	0.009
3–3.5	1.317	0.277	1.359	0.325	1.472	0.306	0.048
3.5–4	1.418	0.348	1.444	0.355	1.661	0.351	0.002
4–4.5	1.459	0.373	1.452	0.406	1.733	0.358	0.001
4.5–5	1.476	0.351	1.481	0.385	1.670	0.386	0.014
5–5.5	1.482	0.337	1.532	0.346	1.712	0.313	0.004
5.5–6	1.582	0.284	1.578	0.329	1.815	0.283	0.001
6–6.5	1.596	0.296	1.576	0.335	1.782	0.306	0.005
6.5–7	1.610	0.274	1.608	0.321	1.824	0.224	0.002
7–7.5	1.793	0.232	1.759	0.242	1.914	0.219	0.015