Table 2.
Sociodemographic characteristics of study samples
| Variable | NC participants, visit 1 (n = 198) | Diagnosed AD participants, visit 1 (n = 25) |
|---|---|---|
| Gender, n (%) | ||
| Male | 100 (50.5) | 6 (24.0) |
| Female | 98 (49.5) | 19 (76.0) |
| Age (years) | ||
| Mean (SD) | 74.4 (5.94) | 75.6 (4.93) |
| Median | 75.0 | 76.0 |
| Age category, n (%) | ||
| 65–69 years | 50 (25.3) | 3 (12.0) |
| 70–74 years | 48 (24.2) | 4 (16.0) |
| 75–79 years | 50 (25.3) | 13 (52.0) |
| 80–88 years | 50 (25.3) | 5 (20.0) |
| Education (years) | ||
| Mean (SD) | 13.4 (2.63) | 11.6 (2.40) |
| Median | 13.0 | 11.0 |
| Educational level, n (%) | ||
| Lower level | 38 (19.2) | 13 (52.0) |
| Higher level | 160 (80.8) | 12 (48.0) |
| Race/ethnicity, n (%) | ||
| White (not Hispanic) | 198 (100.0) | 25 (100.0) |
| MMSE, visit 1 | ||
| Mean (SD) | 29.7 (1.19) | 24.5 (3.20) |
| Minimum, maximum | 25, 32 | 17, 28 |
| CDR score, n (%), visit 1 | ||
| 0 (normal) | 198 (100.0) | 0 |
| 0.5 (questionable dementia) | 0 | 10 (40.0) |
| 1 (mild dementia) | 0 | 13 (52.0) |
| 2 (moderate dementia) | 0 | 2 (8.0) |
Abbreviations: AD, Alzheimer's disease; CDR, Clinical Dementia Rating; MMSE, Mini–Mental State Examination; NC, cognitively healthy controls; SD, standard deviation.
NOTE. Educational levels are 0–9 years for lower level and 10 or greater for higher level for Switzerland.