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Table 2 Summary statistics of significant features for suicidal and non-suicidal groups

From: Acoustic and language analysis of speech for suicidal ideation among US veterans

Variables Overall mean (std) Non-suicidal mean (std) Suicidal
mean (std)
p-adj ϵ2
Time between GCIs - mean 0.0039 (0.0009) 0.0038 (0.0009) 0.0043 (0.0011) 0.03 0.03
Time between GCIs - std 0.0072 (0.0028) 0.0074 (0.0029) 0.0060 (0.0019) 0.05 0.03
Energy contour for voiced segments - std 2.8089 (0.9230) 2.8806 (0.9270) 2.3614 (0.7624) < 0.001 0.04
Energy contour for voiced segments - skewness −0.6763 (0.3286) −0.7059 (0.3288) − 0.4916 (0.2613) < 0.001 0.05
Energy contour for voiced segments - kurtosis 0.0866 (0.7950) 0.1583 (0.8101) −0.3609 (0.5018) < 0.001 0.06
Energy contour for voiced segments - average tilt of a linear estimation −34.9081 (24.2386) −36.2156 (24.4906) −26.7487 (20.9610) 0.04 0.03
Energy contour for voiced segments - average MSE of a linear estimation 5.7945 (3.4302) 6.0285 (3.4929) 4.3348 (2.5833) 0.01 0.03
Delta energy entropy - std 0.3577 (0.0788) 0.3631 (0.0759) 0.3240 (0.0878) 0.04 0.03
Delta MFCC11 - std 0.1881 (0.0172) 0.1893 (0.0169) 0.1805 (0.0169) < 0.001 0.04
Delta MFCC12 - std 0.1823 (0.0154) 0.1832 (0.0152) 0.1761 (0.0154) 0.01 0.03
Delta MFCC1 - std 1.0386 (0.2200) 1.0525 (0.2112) 0.9515 (0.2528) 0.05 0.03
  1. Abbreviations: GCI Glottal closure instants, MSE Mean squared error, std. Standard deviation, MFCC Mel-Frequency Cepstral Coefficients, p-adj Adjusted p-value
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