NEFL and frontotemporal dementia: NfL concentration was not different between men and women (41.2 ± 30.6 pg/ml vs 47.7 ± 30.5 pg/ml, p = 0.167) and across FTD subtypes (bvFTD = 43.5 ± 42.9 pg/ml, avPPA = 45.5 ± 34.5 pg/ml, svPPA = 31.8 ± 14.8 pg/ml, p = 0.517).