Table 1. Mean participant characteristics at baseline (SD).
| non-converters (N = 6,297) |
converters (N = 1,328) |
p value | ||
|---|---|---|---|---|
| Age (SD) | 70.53 (9.91) | 76.85 (8.75) | p < 0.001 | |
| Female | 4,257 (67.6%) | 810 (61.0%) | p < 0.001 | |
| Years of education (SD) | 15.77 (2.90) | 15.18 (3.17) | p < 0.001 | |
| Level of Independence* | 1 | 6,188 (98.3%) | 1,261 (95.0%) | p < 0.001 |
| 2 | 90 (1.4%) | 47 (3.5%) | ||
| 3 | 19 (0.3%) | 17 (1.3%) | ||
| 4 | 0 (0.0%) | 3 (0.2%) | ||
| Type of residence | p < 0.001 | |||
| Single family residence | 5,694 (90.7%) | 1,116 (84.2%) | ||
| Retirement community | 436 (6.9%) | 169 (12.7%) | ||
| ALF/boarding home/adult family home | 17 (0.3%) | 10 (0.8%) | ||
| SNF/NH | 1 (<1%) | 0 (0.0%) | ||
| Other | 133 (2.1%) | 31 (2.3%) | ||
| MMSE | 29.01 (1.32) | 28.48 (1.63) | p < 0.001 | |
| Logical memory | 13.81 (3.79) | 11.02 (4.01) | p < 0.001 | |
| Boston naming | 27.32 (3.09) | 25.91 (3.94) | p < 0.001 | |
| Category fluency (animals) | 20.68 (5.65) | 17.86 (5.18) | p < 0.001 | |
| Category fluency (vegetables) | 15.15 (4.26) | 12.76 (4.03) | p < 0.001 | |
| Trails B–A | 52.96 (39.71) | 74.76 (51.86) | p < 0.001 | |
| Digit span forward | 8.66 (2.03) | 8.28 (2.06) | p < 0.001 | |
| Digit span backward | 6.94 (2.25) | 6.37 (2.10) | p < 0.001 | |
| WAIS | 48.87 (12.33) | 40.92 (11.56) | p < 0.001 | |
| FAQ total (0–30) | 1.92 (6.11) | 3.15 (6.74) | p < 0.001 |
*
Level of Independence: 1: able to live independently; 2: requires some assistance with complex activities; 3: requires some assistance with basic activities; 4: completely dependent.