Table 1. Clinical and demographic information.
| Age |
MMSE score |
Years of education |
Sample size (n) |
|||||
|---|---|---|---|---|---|---|---|---|
| Mean (SD) | Range | Mean (SD) | Range | Mean (SD) | Range | male/female | ||
| AD | 71.5 (7.9) | 53–91 | 22.8 (4.8) | 5–30 | 12.4 (3.1) | 7–19 | 35/45 | |
| MCI | 63.5 (11.1) | 42–85 | 28.2 (2.1) | 20–30 | 14.3 (2.8) | 9–20 | 26/18 | |
| SCI | 63.6 (9.6) | 49–84 | 29.4 (0.6) | 28–30 | 15 (3.3) | 9–22 | 12/14 | |
| Between-group differences (test statistics) | ||||||||
| t | p | t | p | t | p | Χ2 | p | |
| ADvsMCI | 4.6 | 9.5e-6* | −6.6 | 1.1e-9* | −3.3 | 0.001* | 2.1 | 0.148 |
| ADvsSCI | 4.2 | 6.7e-5* | −7 | 2.2e-10* | −3.6 | 4.5e-4* | 1.7e-4 | 0.989 |
| MCIvsSCI | −0.04 | 0.968 | −2.9 | 0.005* | −0.9 | 0.351 | 0.6 | 0.423 |
Notes: Between-group differences were assessed with either two-tailed t-tests (continuous variables) or chi-square (Χ2, contingency tables degree of freedom). Abbreviations: SD, standard deviation; *statistically-significant p-value.