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Table 4 Relationship between parental feeding rate, brood size, nestling age and nest-beginning time for the Isabelline Shrike

From: Male parent birds exert more effort to reproduce in two desert passerines

Model

Fixed effect

Β  ±  SE

t

P

95% CI

Female feeding rate

Brood size

1.108  ±  0.145

7.639

< 0.001

0.821‒1.394

Nestling age

0.481  ±  0.050

9.552

< 0.001

0.381‒0.580

Nest-beginning time

0.012  ±  0.015

0.813

0.418

− 0.017 to 0.042

Male feeding rate

Brood size

1.174  ±  0.158

7.412

< 0.001

0.861‒1.487

Nestling age

− 0.073  ±  0.069

− 2.493

0.014

− 0.310 to − 0.036)

Nest-beginning time

− 0.047  ±  0.014

− 3.343

< 0.001

− 0.074 to − 0.019