Table 4.
Changes in nonlinear features across six consecutive PVT blocks (x̄ ± s)
Nonlinear feature
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
DFA alpha 1
1.18 ± 0.22
1.26 ± 0.2
1.26 ± 0.2
1.25 ± 0.21
1.26 ± 0.22
1.26 ± 0.21
DFA alpha 2
0.4 ± 0.12
0.42 ± 0.1
0.43 ± 0.11
0.43 ± 0.09
0.44 ± 0.11
0.43 ± 0.11
SD1
28.27 ± 16.97
27.08 ± 19.44
27.68 ± 20.37
27.19 ± 14.31
29.02 ± 19.73
27.75 ± 16.73
SD2
55.33 ± 19.75
56.95 ± 19.11
58.79 ± 20.66
59.02 ± 17.99
62.23 ± 20.41
60.34 ± 19.17
SD2/SD1
2.16 ± 0.56
2.32 ± 0.57
2.36 ± 0.55
2.34 ± 0.61
2.38 ± 0.58
2.35 ± 0.59
ApEn
1.3 ± 0.07
1.29 ± 0.09
1.28 ± 0.09
1.28 ± 0.09
1.27 ± 0.1
1.27 ± 0.1
SampEn
1.69 ± 0.2
1.63 ± 0.24
1.61 ± 0.24
1.61 ± 0.24
1.57 ± 0.25
1.61 ± 0.24