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. 2021 Jul 30;9(7):e29840. doi: 10.2196/29840

Table 2.

Descriptive statistics for all 49 Bluetooth features.

Featurea Mean SD Min Q1 Median Q3 Max
Second-order statistics







Max_Max 49.79 48.48 1.00 25.00 40.00 60.00 621.00

Min_Max 5.09 6.22 0.00 2.00 4.00 6.00 90.00

Mean_Max 18.56 18.94 0.75 9.23 14.07 21.62 268.29

Std_Max 13.14 14.05 0.00 6.14 10.45 16.22 195.19

Max_Min 1.59 2.08 0.00 0.00 1.00 2.00 43.00

Min_Min 0.06 0.27 0.00 0.00 0.00 0.00 3.00

Mean_Min 0.58 0.88 0.00 0.00 0.21 0.79 13.71

Std_Min 0.50 0.62 0.00 0.00 0.42 0.70 11.94

Max_Std 12.31 12.76 0.34 5.60 9.51 15.39 185.98

Min_Std 1.20 1.45 0.00 0.56 0.87 1.32 21.61

Mean_Std 4.55 4.87 0.16 2.17 3.25 5.24 70.65

Std_Std 3.24 3.71 0.09 1.34 2.43 4.04 62.52

Max_Mean 9.32 9.34 0.17 4.38 6.88 11.04 136.10

Min_Mean 1.88 2.14 0.00 0.50 1.42 2.50 32.00

Mean_Mean 4.42 4.19 0.07 2.19 3.40 5.28 49.55

Std_Mean 2.13 2.59 0.05 0.84 1.45 2.54 49.37
Multiscale entropy (MSE)







MSE_1 0.80 0.46 0.05 0.42 0.71 1.13 2.44

MSE_2 0.97 0.54 0.04 0.56 0.85 1.31 3.58

MSE_3 1.12 0.66 0.09 0.70 1.01 1.42 9.41

MSE_4 1.23 0.69 0.05 0.82 1.15 1.51 8.83

MSE_5 1.35 0.82 0.10 0.93 1.27 1.62 8.51

MSE_6 1.38 0.84 0.08 0.97 1.28 1.63 8.00

MSE_7 1.47 0.97 0.10 1.01 1.33 1.70 7.72

MSE_8 1.50 1.07 0.10 1.00 1.30 1.67 7.40

MSE_9 1.58 1.22 0.10 0.99 1.32 1.72 7.30

MSE_10 1.58 1.23 0.08 0.97 1.30 1.72 7.08

MSE_11 1.58 1.29 0.09 0.95 1.25 1.67 7.02

MSE_12 1.59 1.33 0.10 0.92 1.23 1.66 6.70

MSE_13 1.74 1.46 0.11 0.98 1.30 1.79 6.55

MSE_14 1.85 1.53 0.11 1.01 1.36 1.87 6.70

MSE_15 1.96 1.62 0.13 1.03 1.39 1.95 6.55

MSE_16 1.98 1.62 0.13 1.03 1.39 1.95 6.40

MSE_17 2.04 1.67 0.14 1.02 1.39 2.08 6.14

MSE_18 2.03 1.65 0.15 1.01 1.39 2.08 6.04

MSE_19 2.09 1.69 0.17 1.01 1.39 2.08 6.04

MSE_20 2.09 1.67 0.17 0.98 1.39 2.08 5.94

MSE_21 2.10 1.66 0.18 0.98 1.39 2.20 5.83

MSE_22 2.13 1.68 0.18 0.98 1.39 2.30 5.83

MSE_23 2.17 1.69 0.18 0.98 1.39 4.28 5.61

MSE_24 2.27 1.70 0.20 0.98 1.39 4.28 5.35
Frequency domain (FD)







LFb_sum 330.66 2469.74 0.05 17.41 53.87 184.80 85956.16

MFc_sum 157.24 1166.32 0.02 8.16 25.77 83.05 34970.35

HFd_sum 602.22 3272.44 0.47 55.72 151.74 403.38 64127.16

LF_pcte 0.25 0.10 0.03 0.17 0.23 0.31 0.63

MF_pct 0.13 0.10 0.01 0.07 0.11 0.17 0.74

HF_pct 0.62 0.15 0.12 0.53 0.64 0.72 0.92

LF_sef 0.83 0.10 0.38 0.78 0.85 0.90 1.00

MF_se 0.82 0.09 0.40 0.77 0.83 0.88 0.99

HF_se 0.90 0.04 0.72 0.88 0.90 0.92 0.99

aDefinitions of Bluetooth features in this table are shown in Table 1.

bLF: low frequency (0-0.75 cycles/day).

cMF: middle frequency (0.75-1.25 cycles/day).

dHF: high frequency (>1.25 cycles/day).

epct: percentage of spectrum power.

fse: spectral entropy.