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Table 1 Baseline characteristics of the study population

From: Vascular health, diabetes, APOE and dementia: the Aging, Demographics, and Memory Study

Variables Non-demented controls
(n = 548)
All-cause dementia (n = 308) Alzheimer's disease (n = 229) Vascular dementia (n = 48)
Mean age (SD), years 78.3 (6.3) 84.5 (6.9) 85.5 (6.7) 84.0 (6.2)
Women, n (%) 288 (59.4) 213 (68.5) 170 (71.5) 28 (62.1)
Education, n (%)     
   8 years or less 166 (14.8) 125 (33.5) 93 (32.3) 18 (33.8)
   9 years or more 382 (85.2) 183 (66.5) 136 (67.7) 30 (66.2)
Ethnic origin, n (%)     
   White 395 (87.7) 218 (83.4) 162 (82.1) 36 (87.3)
   Black 92 (6.9) 67 (12.4) 49 (12.9) 9 (10.5)
   Hispanic 61 (5.4) 23 (4.2) 18 (5.0) 3 (2.2)
HRS wave*, n (%)     
   2000 157 (31.8) 136 (34.4) 98 (34.5) 26 (42.3)
   2002 391 (68.2) 172 (65.6) 131 (65.6) 22 (57.7)
   Mean MMSE total (SD) 27.0 (4.1) 15.9 (6.4) 15.4 (6.4) 18.7 (5.9)
Hypertension, n (%)     
   Untreated 98 (14.9) 61 (23.8) 53 (27.0) 5 (24.0)
   Treated 308 (58.6) 150 (44.2) 100 (38.8) 32 (56.8)
Diabetes, n (%)     
   Untreated 14 (2.1) 16 (4.7) 12 (4.2) 1 (1.3)
   Treated 109 (17.9) 31 (11.9) 12 (7.2) 9 (12.5)
Heart disease, n (%)     
   Untreated 36 (6.1) 32 (11.5) 25 (9.9) 3 (18.3)
   Treated 144 (22.3) 79 (28.2) 53 (28.2) 18 (31.8)
Stroke, n (%)     
   Untreated 114 (17.7) 150 (51.6) 98 (46.0) 36 (82.4)
   Treated 22 (3.8) 24 (7.6) 13 (5.2) 10 (15.2)
   APOE ε4, n (%) 125 (24.4) 110 (38.6) 87 (38.4) 11 (35.7)
  1. Means and percentages are weighted to adjust for the sampling design. *Participants were selected from the 2000 and 2002 waves of the Health and Retirement Study (HRS).. APOE ε4, apolipoprotein ε4; MMSE, Mini-Mental State Examination (scores range from 0 to 30 where higher scores indicate better cognitive function); SD, standard deviation.