Table IV.

Mixed models of facial width-to-height ratio, personality, age, and sex variables

Variable	All individuals		Younger		Older
	B	95% C.I.	B	95% C.I.	B	95% C.I.
Age	−0.21	[−0.56, 0.13]	−0.06	[−1.61, 1.35]	−2.19	[−5.65, 1.30]
Age2	0.41	[−0.25, 1.05]	−0.36	[−7.33, 6.94]]	3.20	[−1.25, 7.60]
Age3	−0.22	[−0.56, 0.13]	0.30	[−9,87, 9.91]	−1.37	[−3.07, 0.36]
Sex	−0.01	[−0.12, 0.11]	0.11	[−0.11, 0.34]	0.13	[−0.21, 0.46]
Confidence	0.03	[−0.14, 0.19]	−0.15	[−0.35, 0.05]	0.37	[0.03, 0.72]
Openness	0.06	[−0.08, 0.19]	0.07	[−0.10, 0.27]	0.29	[−0.01, 0.59]
Assertiveness	−0.03	[−0.21, 0.14]	0.23	[0.05, 0.46]	−0.44	[−0.77, −0.11]
Friendliness	0.01	[−0.07, 0.08]	0.06	[−0.12, 0.22]	−0.09	[−0.27, 0.09]
Activity	−0.10	[−0.2, 0.01]	−0.22	[−0.44, −0.01]	−0.13	[−0.28, 0.02]
Anxiety	0.05	[−0.05, 0.16]	0.00	[−0.25, 0.22]	0.10	[0.05, 0.26]

Removing age variables from the model of younger macaques did not substantively change the results. Bold indicates estimates whose confidence interval did not overlap with 0. We observed rhesus macaques (Macaca mulatta) at the Oregon National Primate Research Center between March and June 2014, and at the California National Primate Research Center between January and April 2014