Table 2.

Summary of the test results for each of the five methods following the Wilcoxon signed-rank test.

Index	modGauss	GAFD	AR	Welch	Wavelet
$\alpha$	$3.52\times {10}^{-5}$	$4.02\times {10}^{-5}$	$6.75\times {10}^{-5}$	$3.52\times {10}^{-5}$	$3.08\times {10}^{-5}$
${\alpha }_{LF}$	$2.06\times {10}^{-4}$	$1.73\times {10}^{-3}$	$5.88\times {10}^{-4}$	$2.06\times {10}^{-4}$	$3.72\times {10}^{-4}$
${\alpha }_{HF}$	$4.02\times {10}^{-5}$	$5.22\times {10}^{-5}$	$1.43\times {10}^{-4}$	$5.94\times {10}^{-5}$	$3.52\times {10}^{-5}$

Legend: modGauss: using modulated Gaussian filter; GAFD: using Gaussian average filtering decomposition; AR: by autoregressive (AR) power spectral density (PSD); Welch: using Welch’s periodogram; Wavelet: by the scalogram using complex Morlet wavelet; α: represents the BRS α index. The BRS $\alpha$ index p values for supine versus standing cases are reported on the same row in each method. ${\alpha }_{LF}$: represents the BRS α index in LF band. The BRS $\alpha$ index p values in LF band for supine versus standing cases are reported on the same row in each method. ${\alpha }_{HF}$: represents the BRS α index in HF band. The BRS $\alpha$ index p values in HF band for supine versus standing cases reported on the same row in each method.