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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

From: Weathering the storm: parental effort and experimental manipulation of stress hormones predict brood survival

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