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 |
