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HRV-status, unit of measurement?

Hi,

As there seem to be several ways of measuring and also presenting HRV (SDNN, SDRR, rMSSD, ln(rMSSD), ln(RMSSD)x20, PNN50 etc...,) I'm curious what unit of measurement Garmin uses for the HRV-status value (i.e the average nightly value). When doing a Health Snapshot, two results are presented: RMSSD and SDRR. But what is the unit for the nightly average value?

Thanks!