Table 3.
Genetic models of trustworthiness (fraction returned in the trust game)
| Model | Heritability, h2 | Common environment, c2 | Unshared environment, e2 | DIC | Dbar | pD |
|---|---|---|---|---|---|---|
| Swedish sample | ||||||
| ACE | 0.18 (0.08, 0.30) | 0.17 (0.08, 0.28) | 0.66 (0.56, 0.75) | 11055.12 | 10889.78 | 165.34 |
| AE | 0.32 (0.18, 0.45) | 0.68 (0.55, 0.82) | 11057.50 | 10899.70 | 157.71 | |
| CE | 0.27 (0.14, 0.41) | 0.73 (0.60, 0.86) | 11064.40 | 10924.20 | 140.25 | |
| E | 1.00 (1.00, 1.00) | 11130.9 | 11128.90 | 2.00 | ||
| U.S. sample | ||||||
| ACE | 0.17 (0.05, 0.32) | 0.12 (0.04, 0.25) | 0.71 (0.60, 0.82) | 10626.82 | 10493.75 | 133.07 |
| AE | 0.28 (0.16, 0.40) | 0.72 (0.60, 0.84) | 10625.04 | 10494.13 | 130.91 | |
| CE | 0.24 (0.13, 0.34) | 0.76 (0.66, 0.87) | 10638.59 | 10529.65 | 108.94 | |
| E | 1.00 (1.00, 1.00) | 10680.27 | 10678.26 | 2.01 |
These results show that we consistently found a significant proportion of variability in trustworthiness is due to heritability, and that the best-fitting models are those that assume a role for genetic effects and the unshared environment (but not necessarily the common environment). For technical details, see Table 2 legend.