Table 1.

Demographic characteristics of frontotemporal lobar degeneration (FTLD) subtypes and Alzheimer's disease (mean ± SD)

	bvFTD n = 40	nfaPPA n = 23	svPPA n = 16	AD n = 106
Age at initial visit	60.98 (9.66)	66.83 (9.22)	63.31 (9.60)	71.78 (8.48)
Education	15.18 (2.72)	14.83 (2.71)	15.56 (3.12)	14.06 (3.35)
MMSE at baseline	25.48 (3.64)	26.17 (2.74)	23.63 (6.46)	21.10 (5.78)
Duration of illness at initial evaluation	24.13 (12.79)	23.04 (11.81)	29.44 (12.61)	25.47 (13.47)

Abbreviation: bvFTD = behavioral variant frontotemporal dementia; nfaPPA = nonfluent agrammatic variant of primary progressive aphasia; svPPA = semantic variant PPA; AD = Alzheimer's disease