Table 1.

Basic demographics in subject groups.

		N	Sex (M/F)	Mean age at time 1 (S.D.)	Mean interscan interval in years (S.D.)
1.5 T	All subjects	81	42/39	64.7 (7.21)	1.08 (0.25)
Healthy	38	15/23	66.42 (7.89)	1.06 (0.17)
All FTLD	43	27/16	63.19 (6.28)	1.11 (0.28)
bvFTD	14	10/4	61.36 (7.03)	1.14 (0.37)
svPPA	29	17/12	64.07 (5.7)	1.14 (0.37)
3 T	All subjects	110	58/52	66.5 (7.78)	1.03 (0.24)
Healthy	67	33/34	69.28 (6.53)	1.05 (0.21)
All FTLD	43	25/18	62.16 (7.65)	0.99 (0.28)
bvFTD	23	13/10	60.65 (7.8)	1.00 (0.29)
svPPA	20	12/8	63.9 (7.26)	0.99 (0.27)