Table 3. Parameter estimates for the best model explaining variation in FGM concentrations between groups of black howler monkeys living in protected and unprotected habitats in Campeche, Mexico.

Response variable	Estimate	SE	d.f.	t ratio	P	Confidence intervals
						Upper limit	Lower limit
Intercept	2.42	0.05	56.95	51.177	<0.001	2.32	2.51
Habitat type	0.00	0.06	64.81	0.006	0.995	−0.13	0.13
Habitat type [non-protected]*agonism	0.15	0.05	140.36	3.112	0.002	0.06	0.25
Habitat type [protected]*agonism	0.05	0.07	129.79	0.723	0.471	−0.08	0.18
Habitat type [non-protected]*season	−0.04	0.05	127.39	−0.718	0.474	−0.13	0.06
Habitat type [protected]*season	−0.17	0.06	142.19	−2.713	0.007	−0.29	−0.05