GRN and frontotemporal dementia: When the genetic FTD patient groups (C9-HRE, GRN, or MAPT) were independently compared to the non-genetic FTD group, only the difference between C9-HRE and non-genetic FTD was statistically significant (B = 0.604, 95%CI = 0.281–0.926, p < 0.001) (Fig. 3).