Table 3.
List of linear markers (time domain), along with a synthetic description.
| # | Marker | Synthetic description |
|---|---|---|
| 1 | Mean RR | Mean value of RR intervals |
| 2 | SDNN | Standard deviation of RR intervals |
| 3 | Mean HR | Mean value of BPM |
| 4 | STDHR | Standard deviation of instantaneous BPM |
| 5 | RMSSD | Square root of the mean squared differences between successive RR intervals |
| 6 | NN50 | Number of successive RR interval pairs that differ more than 50 ms |
| 7 | pNN50 | NN50 divided by the total number of RR intervals |
| 8 | HRV TIN | The integral of the RR interval histogram divided by the height of the histogram |
| 9 | TINN | Baseline width of the RR interval histogram |
| 10 | Mean RR5 | Mean value of the standard deviations of the RR intervals in temporal windows of 5 minutes (RR5) |
| 11 | SDANN | Sample standard deviation of RR5 intervals in the total sampling time of 24 hours |