The Units of mean FD_Jenkinson

Submitted by Yangmei Luo on
 
Hi DPARSFers,
 
I would like to know what is the units if using the “mean FD_Jenkinson” as the index of head motion—mm,degree?  I checked the paper but did not find. Thank you in advance!
 
Any help is appreciated!
 
Best,
 
Yangmei