Fig. 2

HRA results estimated by GI, PI, SI, and AI. a A comparison between healthy subjects and subjects with arrhythmia (results obtained from 54 healthy subjects and 272 subjects with arrhythmia). b A comparison between healthy subjects and CHF patients (results obtained from 54 healthy subjects and 29 CHF patients). Bar indicates mean level and error bar the standard error (SE). All HRA indices were calculated based on the complete HRV recordings. **p <0.001