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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Heart Rhythm. 2013 Oct 9;11(1):110–118. doi: 10.1016/j.hrthm.2013.10.022

Table 3.

Data for RR Power Spectral Analysis in the two different study conditions.

Variables Baseline
N = 144 segments		 7 weeks after MI
N = 144 segments		 P values
Total power (ln ms2) 10.3±0.9 9.3±1.1 <0.0001
Very-low frequency (ln ms2) 7.8±0.9 7.6±1.2 <0.0001
Low frequency (ln ms2) 8.4±1.1 7.5±1.2 <0.0001
Low frequency CF (Hz) 0.112±0.013 0.101±0.012 0.550
High frequency (ln ms2) 9.6±1.1 8.4±1.3 <0.0001
High frequency CF (Hz) 0.24±0.07 0.25±0.08 0.561
Low frequency/High frequency 0.3(0.5) 0.4(0.7) 0.028

Data are expressed as mean ± SD or median (interquartile range). CF is central frequency.