Table 3. Comparison of HRV between the ABI and control groups.

Values are presented as mean (minimum-maximum).

HRV, heart rate variability; ABI, acquired brain injury; SDNN, standard deviations of normal to normal R-R intervals; RMSSD, square root of the sum of the square of differences between adjacent R-R intervals; PSI, physical stress index; ApEn, approximate entropy; SRD, successive R-R interval difference; TP, total power; LF, low frequency; HF, high frequency.

^*p<0.05 according to the Wilcoxon rank sum test.