Table 4 Variation of nonlinear parameters for various age group normal subjects

SD1/SD2

0.5169 ≤ 0.193551

0.5265 ≤ 0.2357

0.4298 ≤ 0.191684

0.6055 ≤ 0.286834

0.12

ApEn

1.903 ≤ 0.34597

2.0722 ≤ 0.1849

1.8746 ≤ 0.3475

1.6837 ≤ 0.4083

< 0.0001

LLE

0.685206 ≤ 0.201294

0.6392875 ≤ 0.089508672

0.438793103 ≤ 0.177914783

0.434278 ≤ 0.294581

< 0.0001

α _s

0.579 ≤ 0.35056

0.412118 ≤ 0.204044

0.138667 ≤ 0.216083

0.224479 ≤ 0.328036

< 0.0001

α _l

2.0062 ≤ 0.33472

1.830926 ≤ 0.149596

1.674143 ≤ 0.205721

1.714868 ≤ 0.222235

< 0.0001