ways of summarising the raw acceleration data (<a href="https://doi.org/10.1371/journal.pone.0061691" class="external-link">van Hees et al. PLoS
ONE 2013</a>). In short, different metrics exist and there is very
little literature to support the superiority of any metric at the time.
As long as different studies use different metrics, their findings will
not be comparable. Therefore, the choice for metric ENMO has been merely
pragmatic. GGIR uses ENMO as default because:</p>
<p>1. ENMO has demonstrated valu