Table 1. Demographics of the sample.
| MZ (n = 186) | DZ (n = 136) | Total (n = 322) | Statistic | P* | |
|---|---|---|---|---|---|
| Sex Females (%) | 120 (64.5%) | 95 (69.9%) | 215 (66.8) | 0.780# | 0.157 |
| Age, mean (SD) | 70.2 (5.1) | 69.9 (4.6) | 70.1 (4.9) | 0.484¶ | 0.620 |
| Education (y) mean (SD) | 11.0 (3.3) | 11.1 (3.3) | 11.0 (3.3) | 0.206¶ | 0.833 |
| MMSE mean (SD) | 28.5 (2.0) | 28.8 (1.3) | 28.6 (1.7) | 1.698¶ | 0.091 |
Note: Mini-Mental State Examination (MMSE) (Folstein et al.23); monozygotic (MZ); dizygotic (DZ).
#Chi-squared test.
¶T-test.
*All p-values were obtained by 10000 permutations.