Table 2. Demographics for human sample.
| Females | Males | Statistics | ||
|---|---|---|---|---|
| Sample size | 516 | 454 | ||
| Age | Mean | 29.41 | 27.9 | F(1,1082)=57.13, p=8.67e-14 *** |
| SD | 3.68 | 3.61 | ||
| Range | 22–36 | 22–37 | ||
| Education (in years) | Mean | 14.96 | 14.84 | F(1,1082)=1.465, p=0.226 |
| SD | 1.83 | 1.77 | ||
| Range | 11–17 | 11–17 | ||
| Euler number | Mean | –52.47 | –58.26 | F(1,1082)=25.72, p=4.65e-07 *** |
| SD | 17.66 | 19.25 | ||
| Range | –126 to –16 | –136 to –16 | ||
| Zygosity | Monozygotic | 102 | 49 | X2=26.281, p=8.33e-06 |
| Dizygotic | 163 | 131 | ||
| Not Twin | 251 | 274 |
*p<0.01 **p<0.001 for ANOVA test of significant difference between groups (males vs. females). SD=standard deviation.