Table 2.

Posterior modes and 95% credible intervals (CI) for each variance component for endocranial volume (millilitres) from the animal model analyses. (Va, additive genetic variance; Vb, birth year effect variance; Vm, maternal variance; Vr, residual variance. Variance components are followed by their 95% CI.)

sourcevariance components (95% CI)per cent of total (95% CI)
model 1: all-ages
Va364.50 (254.68–445.40)63 (50–76)
Vb21.51 (0.0008–39.43)3 (0.0001–7)
Vm0.02 (0.0005–10.11)0.003 (0.00008–2)
Vr164.03 (114.26–231.73)29 (19–44)
model 2: adult-only
Va443.36 (337.19–598.20)79 (61–90)
Vm0.14 (0.0003–59.27)0.02 (0.00005–10)
Vr116.79 (51.38–218.99)21 (7–37)