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Main time-domain HRV features reported across studies.
| Parameter | Studies | Percentage |
|---|---|---|
| RMSSD | 18 | 75.0% |
| SDNN | 14 | 58.3% |
| pNN50 | 8 | 33.3% |
| Mean RR/RR interval | 18 | 75.0% |
RMSSD, root mean square of successive differences between adjacent RR intervals; SDNN, standard deviation of normal-to-normal intervals; pNN50, percentage of successive RR intervals differing by more than 50 ms; RR interval, time interval between consecutive R-peaks in the electrocardiogram.
