Table 5 Intraclass correlations (ICC) according to zygosity and estimates of genetic and environmental effects for the five lower order sub-scales that compose the cooperativeness scale of the Temperament and Character Inventory [95 % confidence interval]

Cooperativeness

0.59

0.40

.38

.21

.41

[.52, .65]

[.32, .48]

[.19, .57]

[.04, .37]

[.36, .47]

(CO1) social acceptance vs. social Intolerance

0.40

0.22

0.42

0.00

0.58

[.32, .48]

[.12, .31]

[.20, .49]

[.00, .18]

[.51, .66]

(CO2) empathy vs. social disinterest

0.41

0.25

0.30

0.10

0.60

[.31, .47]

[.16, .34]

[.06, .47]

[.00, .29]

[.53, .68]

(CO3) helpfulness vs. unhelpfulness

0.35

0.20

0.27

0.07

0.66

[.27, .43]

[.11, .29]

[.03, .42]

[.00, .27]

[.58, .74]

(CO4) compassion vs. revengefulness

0.51

0.36

0.36

0.17

0.47

[.44, .58]

[.27, .44]

[.16, .56]

[.00, .33]

[.41, .55]

(CO5) integrated conscience vs. self-serving advantage

0.34

0.16

0.33

0.00

0.67

[.25, .42]

[.06, .25]

[.11, .41]

[.00, .18]

[.59, .75]