Table 2.
Symbolic entropy t-scores for comparison of anterior-posterior postural sway
| Word length used in symbolic entropy calculation | ||||||||||
| One threshold | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| M | 0.67 | 1.63 | 1.48 | 0.83 | 0.68 | 0.52 | 0.69 | 0.80 | 0.91 | 0.95 |
| Two thresholds | ||||||||||
| m - 1 std, m + 1 std | 0.34 | 1.01 | 1.27 | 0.86 | 0.25 | -0.13 | -0.20 | -0.25 | -0.25 | -0.23 |
| m - .5 std, m + .5 std | -0.25 | 1.17 | 0.51 | 0.11 | -0.21 | -0.42 | -0.13 | 0.15 | 0.31 | 0.40 |
| m - .2std, m + .2std | 1.53 | 1.24 | 1.12 | 1.01 | 1.20 | 1.14 | 1.04 | 0.98 | 0.97 | 1.02 |
| m - .1 std, m + .1 std | 1.67 | 0.52 | 0.80 | 0.86 | 1.08 | 1.31 | 1.62 | 1.79 | 1.87 | 1.92 |
| m - .01 std, m + .01 std | 1.32 | 0.41 | 0.75 | 0.53 | 0.72 | 0.85 | 0.96 | 1.12 | 1.25 | 1.32 |
| m - 2 std, m + 2 std | 0.94 | 1.24 | 1.54 | 1.36 | 0.99 | 0.47 | 0.27 | 0.17 | 0.11 | 0.07 |
| m - 2.5 std, m + 2.5 std | 0.38 | 0.80 | 1.17 | 1.51 | 1.52 | 1.39 | 1.35 | 1.32 | 1.37 | 1.43 |
| m - 3 std, m + 3 std | 0.21 | 0.54 | 0.93 | 1.16 | 1.16 | 1.13 | 1.09 | 1.07 | 1.05 | 1.01 |
| m - 3.5 std, m + 3.5 std | -0.16 | -0.07 | 0.01 | 0.12 | 0.20 | 0.26 | 0.31 | 0.29 | 0.29 | 0.30 |
| m - 2.8 std, m + 2.8 std | 0.98 | 0.89 | 0.90 | 0.94 | 1.04 | 1.08 | 1.08 | 1.09 | 1.11 | 1.16 |
| m - 3.2 std, m + 3.2 std | 0.25 | 0.36 | 0.55 | 0.69 | 0.77 | 0.76 | 0.77 | 0.78 | 0.78 | 0.77 |
| m - 3.1 std, m + 3.1 std | 0.02 | 0.21 | 0.60 | 0.84 | 0.81 | 0.78 | 0.76 | 0.70 | 0.69 | 0.67 |
| m - 2.9 std, m + 2.9 std | 0.22 | 0.38 | 0.65 | 0.86 | 1.01 | 1.03 | 1.03 | 1.01 | 0.98 | 0.97 |
| m - 1 mm, m + 1 mm | 1.63 | 1.29 | 1.15 | 1.40 | 1.32 | 1.21 | 1.06 | 0.98 | 1.01 | 1.09 |
| m - 10 mm, m + 10 mm | -0.60 | -0.28 | -0.47 | -0.56 | -0.58 | -0.67 | -0.70 | -0.73 | -0.73 | -0.74 |
| m - 15 mm, m + 15 mm | -0.74 | -0.36 | -0.19 | -0.20 | -0.45 | -0.74 | -0.87 | -0.97 | -1.08 | -1.18 |
| m - 20 mm, m + 20 mm | -1.33 | -1.19 | -1.27 | -1.39 | -1.48 | -1.57 | -1.66 | -1.69 | -1.66 | -1.66 |
| m - 25 mm, m + 25 mm | -0.94 | -0.74 | -0.89 | -0.89 | -0.94 | -0.99 | -1.02 | -1.01 | -1.03 | -1.03 |
| m - 22 mm, m+ 22 mm | -0.81 | -0.69 | -0.68 | -0.69 | -0.77 | -0.80 | -0.85 | -0.91 | -0.95 | -0.98 |
| m - 30 mm, m + 30 mm | -1.40 | -1.12 | -1.14 | -1.20 | -1.22 | -1.25 | -1.27 | -1.30 | -1.30 | -1.31 |
| m - 35 mm, m + 35 mm | -2.03 | -2.08 | -2.11 | -2.13 | -2.13 | -2.13 | -2.12 | -2.12 | -2.12 | -2.12 |
| m - 40 mm, m + 40 mm | -2.13 | -2.15 | -2.13 | -2.11 | -2.09 | -2.07 | -2.07 | -2.06 | -2.06 | -2.05 |
| m - 2 std, m + 3 std | 0.93 | 1.29 | 1.58 | 1.53 | 1.16 | 0.79 | 0.65 | 0.62 | 0.61 | 0.58 |
| m - 1std, m + 3 std | -0.02 | -0.07 | 0.25 | 0.51 | 0.31 | -0.06 | -0.11 | -0.18 | -0.26 | -0.37 |
| m - 3 std, m + 2 std | 0.16 | 0.40 | 0.73 | 0.80 | 0.82 | 0.56 | 0.36 | 0.20 | 0.05 | -0.02 |
| m - 3 std, m + 1 std | 0.54 | 1.08 | 1.50 | 1.53 | 1.04 | 0.66 | 0.42 | 0.29 | 0.27 | 0.34 |
| Three thresholds | ||||||||||
| m - 1 std, m, m + 1 std | -0.95 | -1.58 | -2.34 | -0.94 | -0.59 | -0.50 | 0.51 | 0.60 | -0.59 | -0.60 |
| m - .5 std, m, m + .5 std | -0.53 | -0.98 | -1.46 | -0.68 | -1.09 | -1.04 | -2.76 | -2.25 | -1.29 | -1.93 |
| m - .2std, m, m + .2std | 0.43 | -1.09 | -1.40 | -1.70 | -2.21 | -2.88 | -1.63 | -0.99 | -0.37 | -0.96 |
| m - .1 std, m, m + .1 std | -1.18 | -0.23 | 0.45 | 0.61 | -0.33 | -0.45 | 0.22 | 0.74 | 0.74 | -0.65 |
| m - .01 std, m, m + .01 std | -1.01 | -1.40 | -2.76 | -2.81 | -2.02 | -2.73 | -3.27* | -2.12 | -1.38 | -0.36 |
| m - 2 std, m, m + 2 std | -1.61 | -1.67 | -0.78 | -0.40 | -0.40 | -1.65 | -1.12 | -1.83 | -2.06 | -3.29* |
| m - 2.5 std, m, m + 2.5 std | -2.28 | -2.37 | -2.66 | -2.15 | -1.70 | -1.13 | -0.90 | -0.43 | -1.64 | -1.70 |
| m - 3 std, m, m + 3 std | -0.99 | -1.49 | -1.31 | -1.13 | -0.94 | -1.22 | -2.02 | -1.68 | -1.89 | -1.82 |
| m - 3.5 std, m, m + 3.5 std | -0.95 | -1.18 | -1.05 | -1.41 | -1.78 | -2.46 | -1.68 | -1.47 | -1.02 | -1.50 |
| m - 2.8 std, m, m + 2.8 std | -1.69 | -2.01 | -1.22 | -0.79 | -1.16 | -1.20 | -1.01 | -0.89 | -0.93 | -1.09 |
| m - 3.2 std, m, m + 3.2 std | -0.97 | -1.17 | -1.64 | -1.43 | -1.57 | -1.54 | -1.65 | -1.51 | -1.61 | -2.30 |
| m - 3.1 std, m, m + 3.1 std | -1.49 | -1.89 | -1.44 | -1.45 | -1.11 | -1.42 | -1.43 | -1.18 | -1.03 | -1.20 |
| m - 2.9 std, m, m + 2.9 std | -1.26 | -1.29 | -1.16 | -1.10 | -1.12 | -1.21 | -1.15 | -1.23 | -1.47 | -1.76 |
| m - 1 mm, m, m + 1 mm | 1.03 | 0.30 | 0.06 | 0.24 | 1.73 | -0.38 | -0.53 | -1.19 | -0.75 | -0.61 |
| m - 10 mm, m, m + 10 mm | 1.20 | 0.98 | 0.30 | 1.56 | 1.39 | 0.98 | 0.74 | 0.15 | 1.08 | 0.57 |
| m - 15 mm, m, m + 15 mm | -2.07 | -1.73 | 1.43 | 0.14 | 0.59 | 1.34 | 1.21 | 1.20 | 1.02 | 0.92 |
| m - 20 mm, m, m + 20 mm | 0.87 | -0.23 | 0.01 | -1.07 | -0.58 | -0.42 | -0.75 | -2.00 | -1.75 | -1.61 |
| m - 25 mm, m, m + 25 mm | 1.49 | 1.60 | 1.41 | 0.49 | 1.15 | 0.97 | 1.11 | 1.10 | 0.88 | -0.38 |
| m - 22 mm, m, m+ 22 mm | 1.06 | 1.53 | 0.30 | 0.58 | 0.89 | 1.51 | 0.88 | 0.67 | 1.09 | 1.44 |
| m - 30 mm, m, m + 30 mm | -0.45 | -0.46 | -0.50 | -0.66 | -0.62 | -0.40 | 1.19 | 0.40 | 1.04 | 1.03 |
| m - 35 mm, m, m + 35 mm | 0.93 | 0.79 | 0.82 | 0.95 | 1.05 | -0.52 | -0.62 | -1.55 | -0.29 | -0.33 |
| m - 40 mm, m, m + 40 mm | 1.18 | 1.80 | 1.14 | 0.69 | 0.59 | 1.14 | 1.03 | 0.70 | 0.97 | 0.86 |
| m - 2 std, m, m + 3 std (A) | 1.30 | -0.31 | -0.52 | -0.59 | 0.43 | 0.42 | 0.41 | 0.45 | 0.45 | 0.47 |
| m - 1std, m, m + 3 std (A) | 0.69 | 1.22 | 1.08 | 0.90 | 1.07 | 1.00 | 0.98 | 1.06 | 1.39 | -0.12 |
| m - 3 std, m, m + 2 std (A) | 0.79 | 0.70 | 0.32 | 0.86 | 1.37 | 1.82 | 1.37 | 0.95 | 0.71 | 1.24 |
| m - 3 std, m, m + 1 std (A) | 0.74 | 0.74 | 0.69 | 0.72 | 0.72 | 0.73 | 0.93 | 0.43 | 0.81 | 0.77 |
t-scores for comparison of anterior-posterior postural sway of infants with typical development and with delayed development, based on symbolic entropy calculated with various thresholds and word lengths, -3.29 is the largest magnitude t-score.
Note: t-scores with magnitude equal or larger than 3.04 are indicated with * and are in bold. The "m" indicates mean value for the time series, "std" indicates the standard deviation for the time series, and "mm" indicates millimetres of movement in the COP. (A) indicates asymmetric thresholds were used