Table 1.
Mean (SE) of Heart Rate Variability Indices for the TETRA and Sham Exposure Conditions. Overall difference between TETRA and sham was significant (P=0.029, multivariate analysis) accounting for 20% of the variance (effect size, r2=0.20).
|
TETRA Status |
|||||
|---|---|---|---|---|---|
|
TETRA On |
Sham |
||||
| Mean | (s.e.) | Mean | (s.e.) | p-Value | |
| N-N Interval/ ms | 906.1 | (17.5) | 912.5 | (17.5) | 0.214 |
| SDNN | 70.8 | (5.3) | 73.3 | (5.5) | 0.124 |
| pNN50 (%) | 26.4 | (2.9) | 28.2 | (2.89) | 0.010a |
| Median | (i.q.r) | Median | (i.q.r) | p-Value | |
| Low Frequency/ ms2 | 869.0 | (1168.1) | 912.9 | (1270.9) | 0.336b |
| High Frequency/ ms2 | 818.4 | (1404.0) | 796.7 | (1254.5) | 0.314b |
| Low : High Frequency ratio | 1.15 | (1.99) | 1.13 | (2.08) | 0.354c |
a
Analysis performed on the arcsine of the square root of the raw data.
b
Analysis performed on the normalised power values (n.u.) and not the raw values (ms2).
c
Analysis performed on the logarithm of the raw data.