Table 2.

Parameter estimates from time-dependent Cox proportional hazard models analyzing factors affecting daily chick mortality for the best-fit candidate models from Table 1. Treatment effects are given for control-implanted females relative to cort-implanted females

Variable	coef	SE	p value
A. Log rank test score = 14.33, df = 4, p = 0.006
Maximum daily temperature	−0.11	0.05	0.050
Relative humidity	−0.03	0.02	0.187
Treatment (control)	−7.42	2.92	0.011
Relative humidity × treatment	0.08	0.03	0.017
B. Log rank test score = 13.51, df = 4, p = 0.009
Female feeding rate per chick	−0.80	0.32	0.014
Male feeding rate per chick	1.00	0.39	0.010
Treatment (control)	1.11	0.72	0.126
Male feeding rate × treatment	−1.53	0.62	0.013
C. Log rank test score = 25.38, df = 8, p = 0.001
Daily max. temperature	0.17	0.12	0.163
Male feeding rate	5.62	2.24	0.012
Treatment (control)	9.14	3.55	0.010
Female feeding rate	−0.64	0.33	0.053
Daily max. temperature × male feeding rate	−0.22	0.10	0.035
Daily max. temperature × treatment	−0.40	0.18	0.023
Male feeding rate × treatment	−7.59	2.96	0.010
Daily max. temperature × male feeding rate × treatment	0.03	0.15	0.043

Coef’ indicates the estimated coefficient and ‘SE standard error of that estimate in the model