Table 4.

Estimates of variance components (and 95% confidence intervals) accounting for individual differences in prosociality facets.

Prosociality facets	Heritability	Shared environment	Non-shared environment and error
Sharing	0.67 (0.5–0.78)	0.00 (0.00–0.00)	0.33 (0.22–0.49)
Social concern	0.56 (0.37–0.70)	0.00 (0.00–0.00)	0.44 (0.30–0.63)
Kindness Helping Empathic concern	0.47 (0.22–0.75)	0.35 (0.08–0.56)	0.18 (0.12–0.27)
Helping	0.44 (0.18–0.64)	0.00 (0.00–0.00)	0.56 (0.36–0.82)
Empathic concern	0.76 (0.62–0.85)	0.00 (0.00–0.00)	0.24 (0.15–0.38)

Heritability estimated as an additive genetic effect.