Table 6.

The eigenvalues from factor analysis.

	Factor 1	Factor 2
SDNN	0.664	0.593
SDSD	0.860	0.064
pNNI50	0.838	−0.075
pNNI20	0.766	−0.081
RMSSD	0.860	0.066
LF	0.450	0.715
HF	0.686	0.101
Total Power	0.559	0.705