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Table 1 General materials of 394 cases (mean ± sd)

From: Informant questionnaire on cognitive decline in the elderly (IQCODE) for assessing the severity of dementia in patients with Alzheimer’s disease

items Mild dementia
(n = 107)
Moderate dementia
(n = 194)
Severe dementia
(n = 93)
F (P)
Age in years 70.10 ± 9.22 70.57 ± 10.05 68.72 ± 9.77 1.137(0.322)
sex (male:female) 52:55 90:104 42:51 0.124(0.883)
Educationg level 6.21 ± 1.70 5.60 ± 1.87 5.39 ± 1.99 5.506(0.004)
MMSE 19.62 ± 2.04 14.86 ± 2.96 8.29 ± 3.25 402.806(0.000)
DRS 112.75 ± 15.25 88.80 ± 13.16 67.52 ± 15.86 236.362(0.000)
ADAS-cog 29.10 ± 11.08 40.45 ± 12.17 53.27 ± 9.38 89.686(0.000)
  1. Education level: 1.Illiteracy, 2. Old-style private school or family education, 3.Adult literacy class or night school, 4. Primary school drop-outs, 5.Primary school, 6.junior high school, 7.senior high school, 8.College or above
  2. Abbreviations: MMSE the mini-mental state examination, DRS the Mattis dementia rating scale, ADAS-cog the Alzheimer’s disease assessment scale-cognitive subscale