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. 2019 May 31;21(6):550. doi: 10.3390/e21060550

Table 1.

Sample entropy (SampEn) and systolic blood-pressure-pulse interval (SBP-PI) cross-SampEn by conditions and groups as mean (SD), with significance p of the factors Group, Time, and of their interaction.

p Value
Day Night Group Time Time *Group
PI SampEn
m = 1 NT 1.02 (0.21) * 1.31 (0.31) 0.25 <0.001 0.10
HT 0.84 (0.14) ** 1.32 (0.27)
m = 2 NT 0.94 (0.23) * 1.22 (0.29) 0.31 <0.001 0.07
HT 0.75 (0.15) ** 1.27 (0.27)
m = 3 NT 0.88 (0.23) * 1.06 (0.21) 0.50 <0.001 0.06
HT 0.69 (0.17) ** 1.14 (0.30)
SBP SampEn
m = 1 NT 1.29 (0.19) 1.41 (0.30) 0.45 <0.05 >0.99
HT 1.37 (0.21) 1.45 (0.29)
m = 2 NT 1.25 (0.19) 1.37 (0.29) 0.49 <0.05 0.92
HT 1.30 (0.18) 1.42 (0.29)
m = 3 NT 1.18 (0.18) 1.24 (0.25) 0.34 0.19 0.83
HT 1.25 (0.18) 1.27 (0.28)
DBP SampEn
m = 1 NT 1.25 (0.24) 1.35 (0.32) 0.83 0.18 0.47
HT 1.26 (0.26) 1.31 (0.29)
m = 2 NT 1.20 (0.25) 1.30 (0.33) 0.83 0.14 0.68
HT 1.19 (0.27) 1.26 (0.30)
m = 3 NT 1.17 (0.25) 1.25 (0.32) 0.90 0.16 0.68
HT 1.16 (0.27) 1.23 (0.31)
SBP-PI cross-SampEn
m = 1 NT 1.22 (0.13) * 1.47 (0.25) 0.78 <0.01 0.86
HT 1.20 (0.15) * 1.43 (0.28)
m = 2 NT 1.19 (0.15) * 1.46 (0.28) 0.70 <0.01 0.67
HT 1.15 (0.14) ** 1.42 (0.28)
m = 3 NT 1.13 (0.15) * 1.33 (0.21) 0.83 <0.01 0.63
HT 1.11 (0.15) ** 1.30 (0.27)

NT = normotensive group (8 subjects); HT = hypertensive group (8 subjects); m = embedding dimension; * and ** indicate significances p, respectively, <0.05 and <0.01 by a posteriori contrasts with False Discovery Rate correction according to [31].