Table 2. The following model was selected with AIC for neocortex size as the dependent variable.

Predictor	b	se	t	p
Female weight	0.564	0.049	11.437	<0.000
Male group size	-0.146	0.073	-2.002	0.053
Female group size	0.233	0.059	3.958	<0.000
Life span	0.266	0.108	2.465	0.019
Female sexual maturity	0.267	0.113	2.358	0.024
Model summary
R2	0.977
λ	1
N	40