Table 1. Participant characteristics for heritability analyses.
| MZ (n = 150) | DZ (n = 110) | Statistic | p-value | |
|---|---|---|---|---|
| Age | 75.7 (5.47) | 76.07 (5.31) | −0.548 | 0.584 |
| Females | 100 (67%) | 79 (72%) | 0.785 | 0.376 |
| Education (yrs) | 10.99 (3.18) | 11.2 (3.18) | −0.475 | 0.635 |
| BMI (kg/m2) | 27.934 (4.74) | 27.5 (4.92) | 0.776 | 0.438 |
| WHR | 0.89 (0.09) | 0.89 (0.08) | 0.164 | 0.87 |
| MMSE | 28.9 (1.37) | 28.95 (1.76) | −0.062 | 0.95 |
| LDL-C (mmol/L) | 2.77 (0.97) | 2.78 (0.97) | −0.078 | 0.938 |
| HDL-C (mmol/L) | 1.73 (0.46) | 1.60 (0.44) | 2.341 | 0.02 |
| Cholesterol (mmol/L) | 5.08 (1.01) | 4.98 (1.12) | 0.822 | 0.412 |
| Triglyceride (mmol/L) | 1.30 (0.54) | 1.32 (0.56) | −0.298 | 0.766 |
| APOE ε4 carrier* | 35 (26%) | 27 (28%) | 0.118 | 0.731 |
Means (SD) are presented for continuous variables, while n (%) is presented for categorical variables. Comparisons of MZ and DZ pairs used t tests for continuous variables and χ (Quehenberger et al., 2010) tests for categorical variables.
Abbreviations: MZ = monozygotic, DZ = dizygotic. body mass index (BMI), mini-mental state exam (MMSE), waist-hip ratio (WHR), low density lipoprotein cholesterol (LDL-C), high density lipoprotein cholesterol (HDL-C).
*excludes participants with missing data (n = 231 participants with APOE genotype data).