Table 1. Results for statistical models examining effect of experimental treatment on and male sexual attractiveness on calling effort.

Results from models (see text) with Z tests for estimated parameters. Values in bold are statistically significant at alpha = 0.05.

Response	Predictor	β	SE	Z	P
(A) Calling (N = 56)	Intercept	−1.911	0.652	−2.931	0.003
	Attractiveness (Un)	−1.855	0.984	−1.886	0.059
	Immune status (Sa)	−2.056	1.012	−2.033	0.042
	Time	0.004	0.001	3.205	0.001
	Immune status (Sa): Attractiveness (Un)	3.224	1.425	2.263	0.024
	Immune status (Sa): Time	0.003	0.002	1.516	0.130
	Attractiveness (Un): Time	0.002	0.002	1.374	0.170
	Immune status (Sa): Attractiveness (Un): Time	−0.004	0.003	−1.419	0.156
(B) Attractive males (N = 28)	Intercept	−1.773	0.563	−3.15	0.001
	Immune status (Sa)	−1.942	0.881	−2.204	0.027
	Time	0.003	0.001	3.205	0.001
	Immune status (Sa): Time	0.003	0.002	1.516	0.129
(C) Unattractive males (N = 28)	Intercept	−4.074	0.952	−4.278	1.88 × 10−05
	Immune status (Sa)	1.298	1.152	1.127	0.260
	Time	0.005	0.001	4.392	1.12 × 10−05
	Immune status (Sa): Time	−0.000	0.001	−0.378	0.705