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Table 3 Zero-inflated Poisson linear model for the number of trips initiated per day against chick age and sex. Linear mixed models for proxies of daily energy and time investments against chick age and the proportion of marine trips

From: Time and energy costs of different foraging choices in an avian generalist species

Dependent variableFactor Estimated marginal mean or coefficient ± s.e.χ2(1)P
Number of tripsChick ageDays0.06 ± 0.0139.9< 0.01
Days2−0.002 ± 0.000332.7< 0.01
SexFemale1.90 ± 0.0718.7< 0.01
Male1.59 ± 0.06  
Summed daily ODBA (g)Intercept 9.47 ± 0.41  
Chick age 0.09 ± 0.0138.7< 0.001
Proportion of marine trips 0.94 ± 0.367.00.008
Time away from colony (h)Intercept 8.76 ± 0.38  
Chick age 0.14 ± 0.01113.0< 0.001
Proportion of marine trips −1.95 ± 0.2946.3< 0.001
  1. Estimated marginal means are the estimated mean for a factor level or a factor level combination. Output of the corresponding analyses of deviance for the significance of the model terms
  2. s.e.,standard error