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Table 1: 
Demographic features of patients and controls
ControlFTDSDPNFA
No.2712139
Sex (M/F)7:203:105:93:6
Age (yr)61.1 (53–78)59.5 (42–72)63.8 (52–77)64.9 (57–78)
MMSE28.7 (25–30)20.8 (10–30)*†22.9 (5–29)*†22.5 (15–28)*‡
Disease duration (yr)–1.7 (0.3–3.4)3.9 (1.3–7.7)*§3.6 (0.1–8.1)
  • Note:—MMSE indicates Mini-Mental State Examination; –, no data; Disease duration, duration between the appearance of the first symptom of the disease to scanning time; FTD, frontotemporal dementia; SD, semantic dementia; PNFA, progressive nonfluent aphasia.
  • * Kruskal-Wallis test.
  • † P <.01 compared with controls.
  • ‡ P <.05 compared with controls.
  • § P < .01 compared with FTD.