HRV Metrics: ln(RMSSD)
ln(RMSSD) is a natural log of RMSSD - in order to distribute the numbers in an easier to understand range. It is still a popular and accurate short-term measurement of the Autonomic Nervous System, backed by hundreds of research papers across health and fitness fields.
For healthy individuals ages 25-74 years, the range is 2.97-3.76. You can find your specific healthy range in the Population Comparison feature of the app!