Intra-QT Spectral Coherence as a Possible Noninvasive Marker of Sustained Ventricular Tachycardia

Table 4

Short-term RR spectral data in the two study groups.

Variables	VT group; 𝑁: 27	No-VT; 𝑁: 97	P values
TP, ms^2	733 [1622]	715 [840]	ns
VLF, ms^2	341 [888]	367 [519]	ns
LF, ms^2	101 [255]	143 [193]	ns
HF, ms^2	85 [231]	79 [141]	ns
LF/HF	1.21 [1.00]	1.64 [2.60]	0.045

Values are expressed as median [interquartile range 75th percentile–25th percentile]. TP: total power; VLF: very-low-frequency power; LF: low-frequency power; HF: high-frequency power (Mann-Whitney U test).