Table II.

Associations between facial width-to-height ratio, age, and sex, split by age group

Variable	Younger				Older
	B	95% C.I.	B	95% C.I.	B	95% C.I.	B	95% C.I.
Age	−0.88	[−1.85, 0.20]	−0.93	[−1.99, −0.05]	−0.59	[−4.19, 2.59]	1.26	[−5.90, 7.88]
Age2	2.90	[−1.90, 7.32]	3.55	[−0.35, 8.18]	0.92	[−3.19, 5.59]	−1.74	[−10.9, 8.50]
Age3	−2.72	[−8.34, 3.48]	−3.88	[−9.72, 1.10]	−0.43	[−2.27, 1.19]	0.76	[−3.59, 4.78]
Sex			−0.12	[−0.21, −0.04]			0.20	[−0.48, 0.84]
Sex × Age			−0.05	[−0.18, 0.07]			−0.20	[−0.81, 0.40]

We fitted two models each to the younger and older data, the first without sex and an age × sex interaction, and a second model with. 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