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. 2015 Jul 6;10(7):e0131447. doi: 10.1371/journal.pone.0131447

Table 4. Evaluation of autonomic nervous system indices using the postural tilt test (supine position).

Variable Control Group IF Group ECG Group LVD Group p value *
Total power (ms2) 2182.99 (1308.00) 945.9 (1551.00) 646.37** (589.02) 1073.10 (2308.01) 0.002
LFr (ms2) 560.71 (364.42) 264.61** (450.93) 104.75** (68.47) 178.46** (557.54) 0.001
HFr (ms2) 326.89 (178.71) 73.64** (157.00) 72.60** (280.00) 362.60 (1005.11) < 0.001
LFr (n.u.) 68.74 (12.35) 70.78 (21.18) 63.19 (18.26) 27.68** (37.57) 0.022
HFr (n.u.) 31.01 (11.61) 29.21 (21.18) 36.80 (18.26) 72.31** (39.36) 0.023
LFr/HFr Ratio 2.19 (1.36) 2.42 (2.42) 1.71 (1.10) 0.38** (1.10) < 0.001

Values expressed as medians (interquartile range)

* p values were calculated using Kruskal-Wallis test

** p <0.05 compared to control group using Tukey test

LFr: low frequency; HFr: high frequency; ms2: milliseconds squared; n.u.: normalized units.